When I compare the best biological age tests, the first distinction is what they actually measure: DNA variants linked with aging or DNA methylation patterns used to estimate age-related biology. For a broader epigenetic snapshot, TruAge Complete Collection stands out with several age metrics, including Dunedin PACE, while Aeternum offers a more focused methylation-based age estimate from saliva. If the goal is to connect genetic findings with everyday wellness recommendations, SelfDecode is the simpler cheek-swab option.
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The tradeoffs are practical as well as scientific. Blood-spot collection may feel less convenient than a cheek swab or saliva sample, but TruAge’s wider set of reported metrics gives it a distinct role. Genetic tests can discuss inherited variants and related traits, but they do not directly establish a person’s current biological age in the same way a methylation-based estimate aims to. I’ve ranked these kits by how clearly they serve a biological-age question, the breadth and usefulness of their reported information, collection burden, and the limits buyers should understand before treating a result as meaningful.
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Key Takeaways
- TruAge Complete Collection is my pick for the broadest aging snapshot: its blood-spot test reports epigenetic age, telomere length, Dunedin PACE, and additional trait insights.
- Aeternum is the more focused choice for a direct methylation-based age estimate from saliva, with online results expected in a few weeks.
- SelfDecode uses a cheek swab to explore genetic variants and healthy-aging recommendations; it is not a direct methylation-age test.
- PlexusDx offers the widest stated DNA-report menu, with more than 150 reports, but its product details do not give a result timeline.
- All four require sending a biological sample to a lab, and their wellness reports should not be treated as medical diagnoses or substitutes for clinical care.
| TruAge Complete Collection |  | Best Overall for a Broad Epigenetic Aging Snapshot | Sample type: Fingertip blood spot | Analysis: DNA methylation markers | Age metrics: Epigenetic age, Dunedin PACE, intrinsic and extrinsic epigenetic age | VIEW LATEST PRICE | See Our Full Breakdown |
| Aeternum DNA Biological Age Test Kit |  | Best Focused Methylation Test for Beginners | Test type: At-home saliva DNA methylation test | Sample: Saliva | Analysis: DNA methylation markers | VIEW LATEST PRICE | See Our Full Breakdown |
| SelfDecode Healthy Aging and Longevity At-Home DNA Test |  | Best for Personalized Genetic Wellness Recommendations | Sample collection: At-home cheek swab | Sample processing: CLIA-certified lab | Analysis: AI analysis across 200 million genetic variants and peer-reviewed research | VIEW LATEST PRICE | See Our Full Breakdown |
| PlexusDx Methylation and Longevity Genetic Test |  | Best for the Broadest Genetic Report Menu | Test type: At-home genetic test | Reports: 150+ DNA reports | Genetic variants analyzed: Over 200 million | VIEW LATEST PRICE | See Our Full Breakdown |
| biological age test | Analysis | Turnaround | Test type |
|---|---|---|---|
| TruAge Complete Collection | DNA methylation markers | 2–3 weeks | — |
| Aeternum DNA Biological Age Te | DNA methylation markers | A few weeks | At-home saliva DNA methylation test |
| SelfDecode Healthy Aging and L | AI analysis across 200 million genetic variants and peer-reviewed research | — | — |
| PlexusDx Methylation and Longe | — | — | At-home genetic test |
More Details on Our Top Picks
TruAge Complete Collection
For a buyer who wants several views of aging rather than one headline number, TruAge Complete Collection is my strongest overall pick. Its fingertip blood-spot sample is analyzed for DNA methylation markers, and the stated report set includes epigenetic age, telomere length, and Dunedin PACE. It also adds intrinsic and extrinsic epigenetic age, immune cell ratios, and weight-loss-response insights. That range gives readers more dimensions to examine than Aeternum’s more focused methylation age report.
The breadth does not make the result a definitive account of health or future lifespan. Biological-age metrics are estimates, and separate measures can tell different stories. I would read the report as a set of wellness indicators rather than a medical verdict or a score to chase. The extra detail is a benefit only if the buyer is comfortable interpreting multiple measures and keeping their limitations in view.
Collection is a real dividing line. TruAge asks for a fingertip blood spot, which may be less appealing than Aeternum’s saliva sample or SelfDecode’s cheek swab. In exchange, its listing describes a particularly wide epigenetic report suite and a stated 2–3 week turnaround. PlexusDx may list more than 150 reports, but those are genetic reports across many traits; TruAge’s appeal is that its key metrics are directly framed around methylation and biological age. The product also states HIPAA-compliant handling and no third-party sharing. I’d choose it for breadth and age-specific measures, not for the least involved collection.
Pros:- Reports several age-related measures, including epigenetic age and Dunedin PACE.
- Includes additional insight into telomeres, immune cell ratios, and weight-loss response.
- States a 2–3 week result window.
- Describes HIPAA-compliant handling with no third-party sharing.
Cons:- Fingertip blood-spot collection is more involved than saliva or cheek swab collection.
- Several metrics can be harder to interpret than one focused age estimate.
Best for: People who want multiple methylation-based aging metrics and are willing to collect a fingertip blood spot for a more detailed report.
Not ideal for: Anyone who dislikes blood collection, wants a simple single-number result, or expects a test to diagnose a health condition.
- Sample type:Fingertip blood spot
- Analysis:DNA methylation markers
- Age metrics:Epigenetic age, Dunedin PACE, intrinsic and extrinsic epigenetic age
- Additional reports:Telomere length, immune cell ratios, weight-loss response
- Turnaround:2–3 weeks
- Data handling:HIPAA-compliant; no third-party sharing
Our verdict“I rank TruAge first for buyers who want the broadest stated set of epigenetic aging metrics and can accept blood-spot collection.”
Aeternum DNA Biological Age Test Kit
Aeternum is the clearest fit for a first-time buyer whose main question is, “How does my estimated biological age compare with my chronological age?” It uses a saliva sample to examine DNA methylation markers and provides a digital biological-age report with lifestyle recommendations. Unlike SelfDecode and PlexusDx, which analyze genetic variants and present related wellness traits, Aeternum is explicitly described as a methylation-based biological age test.
That narrower focus can make the result easier to approach. Buyers do not have to start with a menu of hundreds of genetic reports, and saliva collection avoids the fingertip blood spot required by TruAge. Aeternum is also positioned for repeat tracking over time, which may appeal to someone interested in checking the same kind of estimate again later. I would still avoid treating a single result—or a change between results—as proof that a lifestyle change caused a biological shift.
The main compromise is that its report is less expansive than TruAge’s, which includes Dunedin PACE, telomere length, and other measures. Aeternum also requires mailing the sample, and results take a few weeks, so it is not a rapid check. It is a stronger match than the genetic kits when the buyer prioritizes an age estimate based on methylation, but it offers less stated detail about other aging dimensions. For a straightforward route into biological-age testing, that focus is a useful tradeoff rather than a flaw.
Pros:- Uses DNA methylation markers to estimate biological age.
- Saliva collection avoids a finger-prick blood sample.
- Includes a digital report with lifestyle recommendations.
- The kit includes instructions and a prepaid return mailer.
Cons:- Results take a few weeks after the sample is mailed.
- Its stated report is narrower than TruAge’s multi-metric suite.
Best for: First-time buyers who want a direct methylation-based biological-age estimate, prefer saliva collection, and value an accessible digital report.
Not ideal for: People who want a broad set of aging metrics in one report or need results quickly.
- Test type:At-home saliva DNA methylation test
- Sample:Saliva
- Analysis:DNA methylation markers
- Laboratory:CLIA-certified labs
- Results:Digital biological-age report with lifestyle recommendations
- Turnaround:A few weeks
- Included:Saliva collection device, instructions, prepaid return mailer
Our verdict“I recommend Aeternum for buyers who want a focused saliva-based methylation estimate without TruAge’s broader report complexity.”
SelfDecode Healthy Aging and Longevity At-Home DNA Test
SelfDecode is my pick for people who want to explore inherited genetic factors that may relate to healthy aging and receive practical wellness prompts. It uses an at-home cheek swab and analyzes variants in longevity-linked genes, with an online report offering 50 personalized recommendations. That makes it easier to collect than TruAge’s blood-spot kit and gives it a more action-oriented feel than a report focused mainly on an age estimate.
There is an important difference in what this kit measures. SelfDecode’s description centers on genetic variants and how they may relate to longevity and cellular-aging markers; it does not describe a direct DNA methylation age estimate like Aeternum or TruAge. I would choose it to explore inherited traits and wellness recommendations, not if the sole goal is to get a methylation-based biological-age figure. PlexusDx is the closest comparison: it also offers genetic reports and recommendations, while SelfDecode’s stated offer is more specifically framed around healthy aging and includes 50 recommendations.
The cheek swab keeps collection simple, and a prepaid return mailer is included. Results are viewed online, so this is not a physical report arriving by post. The listing describes encrypted data, HIPAA/GDPR-aligned practices, and an option to delete data, which may matter to buyers sharing genetic information. Its testing is performed in a CLIA-certified lab, but the product is explicitly for educational and wellness use—not for diagnosis or treatment. Compared with Aeternum, SelfDecode gives more recommendations but a different kind of answer; that distinction should drive the choice.
Pros:- Cheek-swab collection requires no blood or needles.
- Online report includes 50 personalized recommendations.
- A prepaid return mailer is included.
- Describes encrypted data and an option to delete it.
Cons:- Genetic-variant analysis is not the same as a direct methylation-based age estimate.
- Results are for educational and wellness purposes, not medical diagnosis or treatment.
- The report is accessed online after mailing the sample.
Best for: People interested in genetic factors associated with healthy aging who want a simple cheek swab and a substantial set of personalized wellness recommendations.
Not ideal for: Buyers specifically seeking a direct DNA methylation-based biological age estimate or a clinical diagnosis.
- Sample collection:At-home cheek swab
- Sample processing:CLIA-certified lab
- Analysis:AI analysis across 200 million genetic variants and peer-reviewed research
- Report:Online personalized report with 50 recommendations
- Return shipping:Prepaid return mailer included
- Privacy:Encrypted; HIPAA/GDPR-aligned; data can be deleted anytime
- Intended use:Educational and wellness purposes only
Our verdict“I’d choose SelfDecode for approachable genetic wellness guidance, but not as a substitute for a methylation-based biological-age test.”
PlexusDx Methylation and Longevity Genetic Test
PlexusDx suits buyers who want a wide-ranging genetics report library that extends well beyond a single biological-age result. Its listing describes more than 150 DNA reports spanning healthy aging, longevity, methylation, and related topics, including biological age, telomeres, cognition, and muscle loss. Personalized diet, supplement, and lifestyle recommendations are part of the offer, making this the broader genetic-information counterpart to SelfDecode’s more focused healthy-aging positioning.
The large report count may be useful for someone who wants to explore many traits from one DNA sample. It should not be confused with a larger collection of direct biological-age measurements, however. The provided details describe an at-home genetic test analyzing variants, so PlexusDx differs from the methylation-marker methods used by Aeternum and TruAge. The product mentions biological age and methylation among its reports, but buyers who specifically want an epigenetic age estimate should check the report’s method and intended interpretation before choosing it.
Sample collection and return are handled at home with a prepaid mailer, much like SelfDecode. The key limitation in the supplied product information is that it does not state how long results take, which makes planning less predictable than with TruAge’s 2–3 week window or Aeternum’s estimate of a few weeks. PlexusDx earns a place for breadth and topic coverage, but I rank it behind the more clearly described methylation tests for readers whose priority is a biological-age measure rather than an expansive genetics library.
Pros:- Includes more than 150 DNA reports across aging and related traits.
- Covers topics such as biological age, telomeres, cognition, and muscle loss.
- Offers personalized diet, supplement, and lifestyle recommendations.
- Includes a prepaid mailer for returning the sample.
Cons:- Requires collecting and mailing a DNA sample.
- The supplied product details do not specify a results timeline.
- A broad genetic report library is not equivalent to multiple direct epigenetic age measures.
Best for: Buyers who want many aging-related genetic reports, including longevity, cognition, and muscle-loss topics, alongside diet and lifestyle suggestions.
Not ideal for: People who want a clearly specified methylation-based biological-age estimate or need a stated turnaround window before ordering.
- Test type:At-home genetic test
- Reports:150+ DNA reports
- Genetic variants analyzed:Over 200 million
- Topics listed:Healthy aging, longevity, methylation, biological age, telomeres, cognition, and muscle loss
- Recommendations:Personalized diet, supplement, and lifestyle suggestions
- Sample return:Prepaid return mailer
- Product dimensions:6.63 x 4.5 x 0.88 inches
- Item weight:2.08 ounces
Our verdict“I’d choose PlexusDx for an extensive aging-related DNA report library, while buyers focused on methylation-based age metrics should start with TruAge or Aeternum.”
How We Picked
I ranked these four kits by their fit for someone searching specifically for a biological age test, not simply a general wellness DNA panel. That distinction matters: methylation-based tests estimate biological age using epigenetic markers, while genetic-variant tests describe inherited variants that may relate to aging traits. Both can offer useful context, but they answer different questions. I give more weight to a clearly described age estimate and several interpretable aging metrics than to a large report count by itself.
I also compared the sample type and effort, the kind of result each kit promises, the stated turnaround, and whether the listing describes privacy and educational-use limits. Those details affect whether a kit is a realistic fit: some people prefer a cheek swab, while others may accept a fingertip blood spot for a broader set of epigenetic measures. I distinguish stated turnaround from information that is not provided rather than guessing how long a lab will take.
Finally, I looked for meaningful differences in what a buyer can do with the report. Personalized recommendations may be helpful for wellness planning, but they do not prove that a particular routine will change biological age. I have not treated any kit as a clinical diagnostic tool, and I have not assumed that results from different testing methods can be directly compared. My order favors age-specific measurement and report breadth, then gives the genetic tests distinct places for buyers who want inherited-risk context or many related traits rather than a standalone epigenetic estimate.
| biological age test | Analysis | Test type |
|---|---|---|
| TruAge Complete Collection | DNA methylation markers | — |
| Aeternum DNA Biological Age Te | DNA methylation markers | At-home saliva DNA methylation test |
| SelfDecode Healthy Aging and L | AI analysis across 200 million genetic variants and peer-reviewed research | — |
| PlexusDx Methylation and Longe | — | At-home genetic test |
Factors to Consider When Choosing Best Biological Age Tests
I would start by matching the test method to the question you want answered. A biological-age label can cover different approaches, and these four kits are not interchangeable. TruAge and Aeternum describe methylation-based testing, while SelfDecode and PlexusDx focus on genetic variants and related traits. The report count, sample type, and advice can matter, but first check whether the product measures the type of aging signal you are actually seeking.
Methylation estimate or genetic background?
DNA methylation tests examine chemical markers associated with how genes are regulated and use those patterns to estimate aspects of biological aging. In this group, TruAge describes several methylation metrics, including Dunedin PACE, and Aeternum describes a methylation-based biological-age report. Genetic-variant tests instead examine inherited differences that may relate to longevity or other traits. SelfDecode and PlexusDx are framed around genetic analysis, so they may add useful inherited context without answering the same question as a direct epigenetic age estimate. I would not compare numbers from different methods as though they were readings on one shared scale.
Choose a sample collection method you will complete
All four options require sending a sample to a lab, so there is no instant, no-mail alternative in this lineup. SelfDecode uses a cheek swab, and PlexusDx is an at-home genetic test with a prepaid return mailer. Aeternum asks for saliva, while TruAge uses a fingertip blood spot. If needles or blood make you uncomfortable, the cheek swab or saliva method may be easier to manage. If you are comfortable with a finger-prick collection, TruAge’s broader stated methylation report may be worth the added collection effort. The simplest kit is the one whose instructions and sample method you can complete correctly.
Treat report breadth as a benefit only when it serves your goal
A longer report is not automatically more useful. TruAge’s breadth is centered on age-related measures such as epigenetic age, telomere length, and Dunedin PACE. PlexusDx’s more than 150 reports cover a wider menu of genetic topics, including cognition and muscle loss. SelfDecode pairs a healthy-aging genetic report with 50 recommendations, while Aeternum keeps its offer more focused on a methylation-based age estimate. I would pick the report that gives you relevant context you can interpret, rather than selecting by the largest number of sections or recommendations.
Read recommendations as prompts, not prescriptions
Personalized diet, supplement, and lifestyle suggestions can help organize questions or guide general wellness planning, but a consumer report is not a personalized medical treatment plan. SelfDecode, PlexusDx, and Aeternum describe recommendations, and TruAge adds trait-specific insights. I would use such material as a starting point for discussion—not as a reason to stop medication, begin supplements, or make major health decisions without a qualified clinician. Genetic and epigenetic information can be complex, and the report’s educational limits matter as much as the recommendations themselves.
Check timing and privacy before sending a sample
Turnaround is stated for some kits but not all: TruAge lists 2–3 weeks, and Aeternum says results arrive in a few weeks. PlexusDx’s supplied details do not specify a timeline, so I would not assume it matches another kit. SelfDecode provides an online report and describes encrypted data, HIPAA/GDPR-aligned practices, and deletion options; TruAge states HIPAA-compliant handling and no third-party sharing. These are different claims, so read the current privacy information for the specific service before mailing a biological sample. A test result is personal data, and buyers should be comfortable with both the lab process and online account access.
Use repeat results cautiously
Aeternum describes its test as usable for tracking biological age over time, and repeat testing may appeal to buyers who want to monitor a measure. Still, I would not assume that a small change proves a lifestyle routine caused it. Results can depend on the method, the sample, and the test’s interpretation. If you plan to compare future readings, stay with the same test and method where possible, follow collection instructions closely, and ask the provider how much variation to expect. For clinical concerns, use healthcare testing and professional advice rather than relying on a consumer biological-age estimate.
Frequently Asked Questions
What does a biological age test measure?
It depends on the test method. Methylation-based kits such as TruAge and Aeternum use DNA methylation markers to estimate aspects of biological age. Genetic tests such as SelfDecode and PlexusDx examine inherited variants associated with aging-related traits and wellness topics. These approaches provide different kinds of information, and none of the four should be treated as a definitive measure of health, lifespan, or disease status.
Which test in this roundup is most directly focused on biological age?
Aeternum is the most focused option in the lineup: its stated purpose is to estimate biological age from saliva-based DNA methylation markers. TruAge is also directly age-focused, but it provides a broader set of epigenetic measures, including Dunedin PACE, telomere length, and additional trait reports. I would choose between them based on whether I wanted a more focused age report or a wider collection of aging metrics.
Are genetic longevity tests the same as epigenetic age tests?
No. Genetic tests assess inherited DNA variants, while epigenetic age tests use markers such as DNA methylation to estimate aspects of biological aging. SelfDecode and PlexusDx are described as genetic tests, whereas Aeternum and TruAge are described as methylation-based tests. The methods answer different questions, so a genetic report mentioning biological age should not automatically be assumed to provide the same kind of estimate as a methylation test.
Can I use these results to diagnose a health condition?
No. These kits are presented for wellness or educational use and should not replace medical evaluation. SelfDecode specifically states that it is not intended to diagnose, treat, cure, or prevent disease. I would discuss concerning symptoms or health decisions with a qualified healthcare professional rather than using a consumer genetic or biological-age report as a diagnosis or treatment guide.
How long do results take?
The stated timelines vary by product. TruAge lists a 2–3 week turnaround, and Aeternum says results are available in a few weeks. The supplied PlexusDx product information does not state a result timeline, and the SelfDecode details provided here do not give one either. Because lab processing and mailing can affect timing, I would check the provider’s current estimate before ordering if a particular date matters.
Conclusion
My recommendation depends on what you want the result to tell you. Choose TruAge Complete Collection if you want the broadest stated set of methylation-based age metrics and are comfortable collecting a fingertip blood spot. Pick Aeternum if you prefer saliva and want a more focused biological-age estimate. For inherited healthy-aging context and a large set of wellness recommendations, SelfDecode is the simpler cheek-swab choice; for a broad aging-related genetic report menu, consider PlexusDx, while noting that its product details do not state a turnaround.
I would not choose among these kits by report count alone. Decide whether you want a methylation estimate or genetic background, then weigh collection comfort, interpretation, privacy, and timing. Whichever option you choose, treat the report as wellness information rather than a medical diagnosis, and use a clinician for health decisions that need clinical judgment.
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