Best Biological Age Tests in 2026: A Complete Guide

If chronological age is how many birthdays you've had, biological age is how old your cells actually behave. A 50-year-old with great sleep, training, and nutrition can have the methylation profile of a 42-year-old. A 50-year-old smoker with chronic stress can be 60 at the cellular level. Knowing which one you are changes everything about how you optimize your protocol.

This guide covers the three biological age tests we recommend in 2026, how epigenetic clocks work, what each test actually measures, and how to choose between them. None of these tests are sold on Amazon, so all links in this article go to the manufacturers' official websites — we don't earn affiliate commissions on them. We're recommending them because they're the best options, period.

What is a biological age test?

A biological age test measures molecular markers in your cells — usually DNA methylation patterns — and uses a statistical model to estimate how biologically "old" you are. The result is a single number (or several numbers) you can compare to your chronological age.

Why this matters: biological age predicts age-related disease risk and all-cause mortality better than chronological age alone. A 2020 study in Aging found that people whose biological age ran 5+ years ahead of their chronological age had significantly higher rates of cardiovascular disease, cancer, and cognitive decline over the following decade. The reverse is also true: people who age slowly at the cellular level tend to live longer, healthier lives.

For longevity-focused users, biological age is the closest thing we have to a "score" for how well your protocol is working. If your NMN, exercise, sleep, and diet interventions are actually moving the needle, you should see your biological age drop or stabilize over 6-12 months. If it's climbing despite your best efforts, something in your protocol isn't working.

For a deeper dive into the science, see our Biological Age Explained guide.

How epigenetic clocks work

The most validated biological age tests measure DNA methylation — chemical tags (methyl groups) that attach to specific sites on your DNA and turn genes on or off. As you age, the pattern of these tags changes in predictable ways. Some sites gain methylation with age, others lose it. By measuring methylation at hundreds of specific CpG sites (regions of DNA where a cytosine is followed by a guanine), algorithms can estimate your biological age with remarkable accuracy.

The first widely-used epigenetic clock was the Horvath Clock, published by Steve Horvath at UCLA in 2013. It used methylation at 353 CpG sites to estimate age across multiple tissues, with a margin of error of about ±3 years. It was a landmark — for the first time, a single blood or saliva test could estimate someone's biological age.

Since then, second- and third-generation clocks have improved dramatically. The newer clocks are "trained" not just on chronological age but on clinical outcomes — they predict mortality, disease, and rate of aging, not just calendar age. This is the difference between a clock that tells you "you look 52" and one that tells you "you're aging faster than average for your age group, and your risk of dying in the next 10 years is elevated."

Horvath vs GrimAge vs PhenoAge vs DunedinPACE

When comparing biological age tests, the most important question is which epigenetic clock they use. Here's the cheat sheet:

Horvath Clock (2013)

The original multi-tissue clock. Estimates age in years. It's accurate but insensitive — large lifestyle changes may not show up as a different number. Still used as a baseline in many tests.

PhenoAge (2018)

Developed by Morgan Levine and colleagues. Trained on a "phenotypic age" composite (based on clinical biomarkers like glucose, creatinine, CRP, and white blood cell count) rather than chronological age. PhenoAge predicts all-cause mortality and age-related disease better than the original Horvath clock.

GrimAge (2019)

Developed by Horvath's group. Trained on a composite of mortality-related biomarkers and smoking pack-years. GrimAge is currently the strongest predictor of lifespan and healthspan in published validation studies. A GrimAge result 5+ years above your chronological age is a meaningful warning sign.

DunedinPACE (2022)

Developed using the Dunedin birth cohort — a longitudinal study that tracked biomarkers of aging in the same people from birth to age 45. DunedinPACE reports a rate of aging (in years of biological aging per chronological year), not just a single age number. A DunedinPACE of 0.95 means you're aging 5% slower than the population average — ideal for tracking whether an intervention is actually slowing your aging rate. This is the clock most longevity researchers now use for intervention studies.

The best tests report multiple clocks so you can see the full picture. A test that only reports one clock (especially just Horvath) is less useful than one that reports GrimAge + PhenoAge + DunedinPACE together.

How to choose a biological age test

Before getting to the recommendations, here's how to think about which test is right for you.

1. Which clock(s) does it report?

Tests that report only the Horvath clock or a single proprietary clock are less useful than tests that report GrimAge, PhenoAge, and DunedinPACE. Look for "third-generation" clocks that were trained on clinical outcomes, not just chronological age.

2. Sample type

Most epigenetic age tests use either a blood sample (finger prick or venous) or saliva. Blood-based tests are slightly more accurate for some clocks, but saliva is more convenient and the difference is small for consumer purposes. Pick the sample type you'll actually complete.

3. Turnaround time

Epigenetic testing requires lab processing that takes 4-8 weeks. Don't buy a test if you need results in a week. Plan around the wait.

4. Report quality

The best reports give you not just a single number but context: how your result compares to your chronological age group, what the confidence interval is, what each clock means, and what you can do to improve. A bare "your biological age is 47" without context is barely useful.

5. Retesting strategy

A single biological age test is informative but limited. The real value comes from testing every 6-12 months to track whether your interventions are working. Pick a test you can afford to repeat. A $499 test you take once is less useful than a $299 test you take annually for three years.

Side-by-side comparison

Best overall: TruDiagnostic

TruDiagnostic is our top biological age test for 2026 because it reports the most comprehensive set of validated clocks in a single test. The TruAge COMPLETE report includes DunedinPACE (rate of aging), PhenoAge, GrimAge, and the newer OMICmAge — a clock that integrates methylation with other omics data for higher accuracy.

The test uses a finger-prick blood sample collected at home. Sample collection takes about 10 minutes, and results arrive 4-6 weeks later via their online portal. The report is detailed: you get each clock's estimate with confidence intervals, a comparison to your chronological age group, and most importantly, the DunedinPACE rate-of-aging metric that's most useful for tracking interventions.

TruDiagnostic is the test most longevity clinicians use with their patients. The company has published validation studies in peer-reviewed journals and partners with several academic research groups. If you want the most validated, most comprehensive biological age test available to consumers, this is it.

The trade-offs: at $499 it's expensive, and retesting annually adds up. The report is comprehensive but can feel overwhelming if you don't have a clinical background. Some users prefer Elysium's more polished report (below).

Price: $499 · Sample: Finger-prick blood · Turnaround: 4-6 weeks · Clocks: DunedinPACE, PhenoAge, GrimAge, OMICmAge

Best budget: myDNAge

myDNAge was one of the first consumer biological age tests on the market, and at $299 it remains the most affordable legitimate option. The test uses a proprietary algorithm based on the Horvath clock and reports a single biological age number.

The test offers a choice of sample types — urine or blood — both collected at home. The urine option is unique among epigenetic tests and is the most convenient if you'd rather not prick your finger. Turnaround is 3-5 weeks, slightly faster than the competition.

The trade-off is real: myDNAge reports only one clock, and it's a proprietary version of the older Horvath clock rather than the newer GrimAge or DunedinPACE clocks that better predict health outcomes. You get a single number that estimates your biological age in years, but you don't get a rate-of-aging metric or mortality-predictive clocks. For users who want a quick, affordable snapshot, that's fine. For users who want to track whether an intervention is actually slowing their aging rate, TruDiagnostic or Elysium are better.

Price: $299 · Sample: Urine or blood · Turnaround: 3-5 weeks · Clocks: Proprietary (Horvath-based)

Best report quality: Elysium Index

Elysium Index is the most polished biological age test we've used. The report is clean, well-designed, and genuinely educational — you'll come away understanding what each clock measures and what your result means, even if you have no biology background.

Index uses a saliva sample (no finger prick), which makes it the most convenient test in this list. Results arrive 4-6 weeks later via the Elysium app. The report includes three of the most validated clocks — PhenoAge, GrimAge, and a rate-of-aging metric Elysium calls "OMICmAge" — along with detailed explanations and lifestyle recommendations.

Elysium is a science-forward company cofounded by Leonard Guarente (an MIT aging researcher), and they publish peer-reviewed validation studies for their tests. The report quality is genuinely best-in-class — the visualizations are clearer than TruDiagnostic's, even if the underlying data is similar.

The trade-offs: at $499 it's the same price as TruDiagnostic but reports fewer clocks. Elysium also heavily cross-sells their supplements (Basis, Matter, etc.), which can feel like a marketing push if you're just there for the test. If you want the cleanest report and a saliva sample, Index wins. If you want the most clocks, TruDiagnostic wins.

Price: $499 · Sample: Saliva · Turnaround: 4-6 weeks · Clocks: PhenoAge, GrimAge, OMICmAge

How to actually use your result

Getting your biological age tested once is interesting. Getting it tested twice, 6-12 months apart, is where the real value is. Here's the playbook:

1. Get a baseline test before starting any major longevity protocol. If you're already taking NMN, exercising, and optimizing sleep, that's fine — just know your baseline is post-protocol.
2. Wait at least 6 months before retesting. Epigenetic patterns don't shift meaningfully in less time than that, and the test's margin of error (±1-3 years depending on the clock) means changes smaller than that are noise.
3. Look at the rate-of-aging metric (DunedinPACE or OMICmAge) more than the absolute age. A rate of 0.95 means you're aging 5% slower than average. This metric responds to interventions faster than the absolute age number.
4. Don't panic about a single bad result. A single biological age 5 years above your chronological age is a warning sign, not a death sentence. It's information you can act on. See our complete guide to lowering your biological age for the evidence-based playbook.
5. Pair the test with biomarkers. Biological age is one signal. Combine it with HRV (from a wearable like Oura or Apple Watch), VO2 max (from a fitness test), and basic bloodwork (APOB, fasting insulin, hsCRP) for a complete picture.

The bottom line

For most readers, TruDiagnostic is the best biological age test in 2026. It reports the most validated clocks in a single test, including DunedinPACE — the rate-of-aging metric most useful for tracking interventions. At $499 it's not cheap, but for serious longevity optimization it's the test most clinicians use.

If budget matters and you just want a single snapshot, myDNAge at $299 is a legitimate entry point. You'll get one biological age number based on the Horvath clock. Just understand that you're getting less predictive data than the premium tests.

If you want the most polished report and a saliva sample (no finger prick), Elysium Index is the winner. Same $499 price as TruDiagnostic, slightly fewer clocks, but a significantly better report experience.

Whichever test you choose: treat your first result as a baseline, wait 6-12 months, retest, and use the rate-of-aging metric (not just the absolute number) to judge whether your protocol is working. Biological age is the single most important longevity biomarker we have — but only if you measure it more than once.

Amazon-available longevity tracking products to pair with your test

While the biological age tests above are only sold direct from the manufacturers, here are Amazon-available products we recommend to track your longevity metrics between biological age tests: