Epigenetic Age Tests

Epigenetic age tests estimate your biological age by reading chemical tags on your DNA. These tags are called DNA methylation patterns.

What is DNA methylation? Methyl groups (CH3) attach to specific spots on your DNA. They do not change your genetic code. But they change how genes get used, basically turning them on or off.

The key finding: Researchers noticed that these tags shift in predictable ways as you age. By reading hundreds or thousands of spots at once, an algorithm can guess how old your body looks at the cellular level.

How the test works:

1. You send in a sample (blood or saliva, depending on the test)
2. The lab pulls DNA out of the sample
3. Methylation patterns at specific spots are measured
4. An algorithm compares your patterns to reference data
5. Your biological age gets calculated

What you get back: Most tests give you a biological age number. Many also add extras like pace of aging (how fast you are aging per year) or system-specific ages for immune and metabolic health. Some include suggestions based on your results.

The whole thing usually takes two to four weeks from sending your sample to getting results.

Several epigenetic clocks exist. Each has its own strengths.

Horvath Clock (2013) The original clock, built by Steve Horvath. Reads methylation at 353 CpG sites and works across different tissue types. Good for a general biological age estimate.

Hannum Clock (2013) Tuned for blood samples. Reads 71 sites. Often used next to Horvath for comparison.

PhenoAge (2018) Built by Morgan Levine. Designed to predict healthspan and disease risk, not just your calendar age. It is built on clinical markers linked to death risk.

GrimAge (2019) First-authored by Ake T. Lu with Steve Horvath as senior author. Strongly predicts death risk, heart disease, and cancer risk. It factors in smoking history and blood protein levels. A common pick for predicting health outcomes.

DunedinPACE (2022) Measures your pace of aging from a single test. It estimates how fast you are aging per year rather than your total biological age. A pace of 1.0 means one biological year per calendar year. Lower is better.

Which one to pick? For tracking lifestyle changes, DunedinPACE tends to respond quickest. For a general biological age estimate, GrimAge or PhenoAge are strong picks. Many commercial tests blend several clocks into one result.

Which clock is in which product (2026 matrix)

• TruDiagnostic TruAge Complete: DunedinPACE + SYMPHONYAge + OMICmAge bundled in one kit. Blood-spot sample by mail. Strong current validation across the major aging-clock metrics, and the usual top pick when you want a multi-clock methylation report in one go. (May 2026: ~$469 USD standalone, $429–$499 across vendors.)
• MyDNAge: Horvath-style clock. Offers blood or urine sampling, which is rare.
• Elysium Index: PhenoAge-lineage clock on saliva (developed with Morgan Levine); pricing varies — check the current rate at elysiumhealth.com (historical listings around $299 subscription / $499 one-time). Reports cumulative biological age and pace metrics. Cheaper than TruDiagnostic but narrower analysis.
• GlycanAge: not epigenetic. Measures IgG N-glycans (a marker of inflammatory age). Treat it as complementary, not a substitute, for a methylation clock.
• Muhdo: saliva-based multi-clock panel. Cheaper, easier to ship, but less validated in peer-reviewed literature than the TruDiagnostic stack.

Retest cadence by clock type

How often retesting actually tells you something depends on which clock you're reading:

• DunedinPACE responds faster to lifestyle change than absolute-age clocks. Retesting every 6-12 months is meaningful if you're actively making changes (exercise, diet, sleep, stopping smoking).
• GrimAge or PhenoAge: retest every 18-36 months. The measurement noise (~3-5 years MAE) exceeds the annual change you'd expect in most people. Testing yearly mostly shows noise, not signal.

EU-shipping note

US-shipped kits (TruDiagnostic, MyDNAge, Elysium, TA Sciences) trigger EU import VAT (19% DE / 20% AT / 8.1% CH) on the full declared value — since the EU abolished the €22 low-value VAT exemption on 1 July 2021, VAT is owed from the first euro. Customs duty (the threshold most people remember) only kicks in above €150, plus carrier handling charges of **€6-20** from DHL or UPS. Typical total upcharge on a €500 kit: ~€100-130. EU-based options (Muhdo, Lifeline HealthEcho, Ganzimmun via a German lab) avoid this entirely; GlycanAge processes samples at the Genos Glycoscience lab in Zagreb, Croatia (an EU member state), so EU customers ship within the EU and avoid UK-EU customs handling. Factor this into any price comparison.

The numbers: The best epigenetic clocks are usually off by just a few years when guessing calendar age. This can shift based on the group tested and the test conditions. Correlation with calendar age runs around r = 0.96, which is very high. Accuracy drops for people under 20 or over 70.

What the experts say:

Luigi Ferrucci, scientific director at the National Institute on Aging, told NPR in 2024: "At this point, if you want to do it, it must be based on curiosity." He warns that results should not drive medical decisions and should be read carefully.

Steve Horvath (senior author on GrimAge alongside first author Ake T. Lu) has noted that for accurate lifespan prediction, methylation-only clocks tend to perform best when combined with clinical variables like blood pressure, glucose metabolism, and lipid levels.

Limits to keep in mind:

• Tests give you a snapshot, not your fate
• Results can bounce around based on recent life stuff (illness, stress, bad sleep)
• Different clocks often give different ages for the same person
• There is no agreed standard for what a "normal" biological age should be
• Long-term predictive power is still being worked out

How to read your results: Treat your epigenetic age as one useful number, not the final word. The real value is tracking the trend over time, not obsessing over a single result. If your biological age keeps coming in lower than your calendar age, and your pace of aging is under 1.0, you are likely doing well.

What they cost: Commercial epigenetic tests run from $100 to $500 or more per test. Premium tests with deeper analysis and multiple clocks sit at the top end. Costs add up fast if you test several times a year.

When a test makes sense:

• You are making real lifestyle changes and want some objective feedback
• You are data-driven and motivated by seeing numbers move
• You can afford regular testing without stressing your budget
• You understand the limits and will not over-read a single number
• You are working with a doctor on longevity goals

When to skip it:

• You have not yet put the basic lifestyle changes in place
• The cost would hurt your budget
• You would stress out over the result
• You want a single test to "diagnose" your overall health
• You expect it to tell you exactly how long you will live

The honest truth: You do not need a test to improve your health. The lifestyle changes that are associated with a lower biological age are the same whether you test or not. They are exercise, good food, sleep, and managing stress.

Testing is most useful for people already working on their health who want data to confirm things are moving in the right direction, or to spot areas needing more focus.

You do not need an expensive test to estimate biological age or track your health.

Free tools:

Our Photo Age Test: Uses AI to estimate biological age from visible aging cues in a photo. Not as precise as an epigenetic test, but free and instant.

Our Pace of Aging Test: A questionnaire that factors in things associated with biological age: sleep, exercise, diet, stress, social connection, and more.

Movement tests you can do at home:

• Your resting heart rate (lower is generally better)
• How many pushups can you do?
• Can you sit down and stand up without using your hands?
• Stand on one leg with your eyes closed. How many seconds?
• How fast can you walk a set distance?

Blood tests through your doctor: Standard blood panels say a lot about how you are aging:

• Fasting glucose and HbA1c (metabolic health)
• Lipid panel (heart and blood vessel health)
• CRP (inflammation)
• Vitamin D
• Complete blood count

These routine tests are often covered by insurance and give you something you can actually act on.

Bottom line: Start with free tools and standard blood markers. If you want more data and have the budget, epigenetic tests can add insight. But they are not required to make real progress.