Biological Age Tests Explained: Epigenetic Clocks, Blood Scores & How to Compare Them

“Biological age” sounds like a single number hiding inside your cells. In practice it is a family of models: DNA methylation clocks, immune glycan patterns, blood-chemistry scores, and weaker consumer metrics like telomere length. Companies then wrap those models in kits, apps, and memberships. This guide explains what each class measures, how to interpret a result without spiraling, and which leading tests deserve a place in a longevity toolkit.

We compare eleven options spanning TruDiagnostic TruAge COMPLETE, NOVOS Age, Elysium Index, myDNAge, TallyAge, GlycanAge, InsideTracker InnerAge, Function-style comprehensive labs, DIY PhenoAge, Clock Foundation–class GrimAge reports, and consumer telomere kits. Related low-tech biomarker context: Grip Strength as a Health Biomarker.

Key takeaways

• Best first move for most people: actionable blood work — DIY PhenoAge labs or InnerAge-class panels.
• Best deep epigenetic kit: TruDiagnostic TruAge COMPLETE (multi-clock + pace + organ-system reporting).
• Best pace-focused mid epigenetic option: NOVOS Age.
• Best saliva epigenetic convenience: Elysium Index.
• Best complementary immune/inflammation lane: GlycanAge.
• Best outcome-trained classic methylation lane: GrimAge/PhenoAge-class reports (Clock Foundation and similar).
• Usually skip for decisions: consumer telomere length kits.
• Biggest mistake: treating one kit’s “bio age” as a diagnosis or as comparable to a different brand’s score.

What “biological age” means (and does not)

Chronological age counts birthdays. Biological age estimates try to summarize how aged your physiology looks relative to peers — using molecular or clinical signals that correlate with morbidity, mortality, or functional decline in cohorts.

Important limits:

• A score is a model, not a stopwatch inside your mitochondria.
• Cross-test comparisons are shaky. A 42 on one kit and a 38 on another may not mean you “got younger.”
• Consumer kits are not FDA-cleared medical diagnostics for treating disease.
• Behavior still dominates. Sleep, cardiorespiratory fitness, strength, metabolic health, and not smoking move outcomes more than buying another dashboard.

The main test classes

1. Epigenetic clocks (DNA methylation)

Cells add chemical tags (methyl groups) to DNA in patterns that shift with age and exposures. Algorithms trained on those patterns estimate age or aging rate.

• First-generation clocks (Horvath-lineage) were trained largely to predict chronological age. Useful historically; less ideal as a sole intervention tracker.
• Second-generation clocks (PhenoAge, GrimAge) incorporate health-outcome information and generally relate more strongly to risk.
• Pace metrics (DunedinPACE) estimate how fast you are aging now — more like a speedometer than an odometer.

Consumer products differ in sample type (blood vs saliva vs cheek swab), which clocks they report, and how much organ-system theater they add.

2. Blood-chemistry “inner age” scores

These use clinical labs — lipids, glucose, inflammation markers, organ enzymes, and similar — to estimate risk or an algorithmic age. They are usually more actionable in the short term because you can target the markers themselves.

PhenoAge also exists as a published blood-biomarker calculation you can approximate from standard labs without a boutique methylation kit.

3. Glycan / immune aging

IgG antibody sugar patterns (glycans) change with age and inflammatory status. GlycanAge-class tests read that axis. Treat them as complementary to methylation — not as a drop-in replacement.

4. Telomere length

Telomeres shorten with cell division and relate to aging biology in research. As a personal dashboard, consumer telomere kits are usually too noisy and weakly actionable compared with blood panels or pace clocks.

How we evaluate biological age tests

1. Scientific class honesty (30%) — DNAm vs blood vs glycan vs telomere, clearly labeled.
2. Validation tier (25%) — outcome-trained clocks and pace metrics outrank curiosity metrics.
3. Actionability (20%) — can the result change next quarter’s behaviors?
4. Longitudinal usefulness (15%) — noise vs signal for retesting.
5. Ownership friction (10%) — collection method, price, membership fog.

Validation tier in the comparison table: 1 = strongest published aging-biology lane for consumers, 2 = solid complementary or classic options, 3 = weak decision tools.

Detailed reviews

Below are deeper notes on every option in the comparison table, sorted by editorial score. Jump directly from the table pins or the cost section.

TruDiagnostic TruAge COMPLETE PhenoAge from Standard Blood Labs (DIY) Clock Foundation GrimAge / DNAm Report InsideTracker InnerAge 2.0 NOVOS Age GlycanAge Elysium Index Function Health Comprehensive Labs myDNAge Tally Health TallyAge Consumer Telomere Length Kit

TruDiagnostic · Epigenetic-kit

TruDiagnostic TruAge COMPLETE

Best for: Deepest consumer epigenetic report: biological age, pace of aging, and organ-system clocks in one kit

About $450–$500 per COMPLETE kit (promos and bundles vary) Battery: 1 days Optional multi-test plans — not required for a single kit Amazon

TruAge COMPLETE is the deep epigenetic option for people who want more than a single “bio age” headline — pace plus organ-system context, with the honesty that numbers still need behavior change to matter.

Multi-metric DNA methylation kit.

Epigenetic clocks estimate aging from DNA methylation patterns; newer pace metrics aim to track rate of aging rather than only a static age.

TruAge COMPLETE is the deep epigenetic option for people who want more than a single “bio age” headline — pace plus organ-system context, with the honesty that numbers still need behavior change to matter.

Pros

• +Multi-clock epigenetic depth
• +Pace-of-aging metric
• +Organ-system age reporting
• +At-home blood kit

Cons

• -Premium price
• -Not a medical diagnosis
• -Easy to over-interpret organ ages

Choose this if

• Deepest consumer epigenetic report: biological age, pace of aging, and organ-system clocks in one kit
• Multi-metric DNA methylation kit
• Readers who separate clocks from clinical care

Skip this if

• You have not optimized sleep, training, and basic labs yet
• You want a cheap monthly number more than a yearly deep read

Estimated ownership: about $500 in year 1 and $1,500 over 3 years. Assumes roughly one COMPLETE test per year at ~$500. Quarterly plans change the math.

Levine PhenoAge method · Diy-score

PhenoAge from Standard Blood Labs (DIY)

Best for: Lowest-cost outcome-trained biological age estimate from routine blood markers

About $50–$150 depending on lab access and insurance Battery: 2 days No membership — standard labs plus a published calculator

DIY PhenoAge is the highest-ROI bio-age move for many: get the labs, run a published calculator, fix the markers. Skip boutique branding until this is boring.

Published blood-chemistry age score.

PhenoAge-style scores use clinical biomarkers trained on morbidity/mortality outcomes — a different, often more actionable lane than first-generation methylation age.

DIY PhenoAge is the highest-ROI bio-age move for many: get the labs, run a published calculator, fix the markers. Skip boutique branding until this is boring.

Pros

• +Low cost
• +Outcome-trained blood markers
• +Easy to retest

Cons

• -DIY calculator friction
• -Not epigenetic DNAm
• -Lab access varies

Choose this if

• Lowest-cost outcome-trained biological age estimate from routine blood markers
• Published blood-chemistry age score
• Readers who separate clocks from clinical care

Skip this if

• You cannot get the required labs drawn
• You specifically need a methylation pace protocol

Estimated ownership: about $160 in year 1 and $480 over 3 years. Assumes one or two self-pay lab panels per year if insurance does not cover.

Clock Foundation · Epigenetic-kit

Clock Foundation GrimAge / DNAm Report

Best for: Outcome-oriented methylation clocks (GrimAge/PhenoAge lineage) from a research-clock organization

About $300–$400 class depending on plan and report tier Battery: 1 days Optional advanced plans — single reports available depending on offer

Clock Foundation-style GrimAge/PhenoAge reports sit in the scientifically serious methylation lane: outcome-trained clocks without requiring the flashiest consumer dashboard.

Outcome-trained epigenetic clock report.

Second-generation clocks like GrimAge and PhenoAge were built around health outcomes and mortality risk — often more informative than clocks trained only to predict chronological age.

Clock Foundation-style GrimAge/PhenoAge reports sit in the scientifically serious methylation lane: outcome-trained clocks without requiring the flashiest consumer dashboard.

Pros

• +Outcome-trained clock lineage
• +Research-forward framing
• +At-home blood kit class

Cons

• -Plan/options complexity
• -Not a medical diagnosis

Choose this if

• Outcome-oriented methylation clocks (GrimAge/PhenoAge lineage) from a research-clock organization
• Outcome-trained epigenetic clock report
• Readers who separate clocks from clinical care

Skip this if

• You want organ-system ages as the primary UX
• Blood-biomarker actionability is your only goal

Estimated ownership: about $325 in year 1 and $975 over 3 years. Assumes roughly one report per year.

InsideTracker · Blood-panel

InsideTracker InnerAge 2.0

Best for: Actionable blood-biomarker “inner age” with clear diet and lifestyle levers — not an epigenetic clock

About $249+ depending on panel tier and draw method Battery: 2 days Optional membership and retesting plans — blood panel can stand alone

InnerAge is the best first bio-age-adjacent purchase for many people: blood markers you can act on in weeks to months. It is not a DNA methylation clock — and that is often a feature.

Blood-biomarker age algorithm.

Blood chemistry panels estimate aging risk and “inner age” from clinical labs — highly actionable, different science than epigenetic clocks.

InnerAge is the best first bio-age-adjacent purchase for many people: blood markers you can act on in weeks to months. It is not a DNA methylation clock — and that is often a feature.

Pros

• +High actionability
• +Familiar clinical biomarkers
• +Faster feedback loops

Cons

• -Not epigenetic DNAm
• -Not a medical diagnosis by itself
• -Plan tiers complicate price

Choose this if

• Actionable blood-biomarker “inner age” with clear diet and lifestyle levers — not an epigenetic clock
• Blood-biomarker age algorithm
• Readers who separate clocks from clinical care

Skip this if

• You specifically need a methylation pace metric for a research-style protocol
• A clinician already runs a smarter custom lab panel for you

Estimated ownership: about $500 in year 1 and $1,500 over 3 years. Assumes roughly two actionable panels per year if you use it for coaching loops.

NOVOS · Epigenetic-kit

NOVOS Age

Best for: Pace-focused epigenetic testing with a longevity-brand ecosystem around the report

About $300–$375 typical street range Battery: 1 days No required membership — kit purchase

NOVOS Age is a strong mid-price epigenetic pick when you care most about pace of aging rather than the widest organ-clock dashboard.

Pace-oriented DNA methylation kit.

Epigenetic clocks estimate aging from DNA methylation patterns; newer pace metrics aim to track rate of aging rather than only a static age.

NOVOS Age is a strong mid-price epigenetic pick when you care most about pace of aging rather than the widest organ-clock dashboard.

Pros

• +Pace-of-aging emphasis
• +At-home blood kit
• +Lower than COMPLETE-tier pricing

Cons

• -Supplement-brand adjacency
• -Not a medical diagnosis

Choose this if

• Pace-focused epigenetic testing with a longevity-brand ecosystem around the report
• Pace-oriented DNA methylation kit
• Readers who separate clocks from clinical care

Skip this if

• You want the widest multi-organ report in one purchase
• You refuse any brand that also sells supplements

Estimated ownership: about $350 in year 1 and $1,050 over 3 years. Assumes roughly one test per year. Bundles with supplements are optional noise.

GlycanAge · Glycan-kit

GlycanAge

Best for: Immune and inflammation-linked aging signal via IgG glycans — complementary to methylation clocks

About $300–$400 typical Battery: 2 days No required membership — kit purchase; consult add-ons may be offered

GlycanAge measures a different axis of aging biology — IgG glycosylation — so it complements epigenetic clocks rather than replacing them. Use it when inflammation and immune aging are the question.

IgG glycan aging kit.

Glycan patterns on antibodies shift with age and inflammatory state — a different lens than DNA methylation clocks.

GlycanAge measures a different axis of aging biology — IgG glycosylation — so it complements epigenetic clocks rather than replacing them. Use it when inflammation and immune aging are the question.

Pros

• +Immune/inflammation biology lane
• +Complements DNAm clocks
• +At-home blood kit

Cons

• -Not an epigenetic multi-clock suite
• -Not a medical diagnosis

Choose this if

• Immune and inflammation-linked aging signal via IgG glycans — complementary to methylation clocks
• IgG glycan aging kit
• Readers who separate clocks from clinical care

Skip this if

• You only want a methylation pace metric
• You will not change inflammation-related behaviors after the result

Estimated ownership: about $350 in year 1 and $1,050 over 3 years. Assumes roughly one test per year.

Elysium Health · Epigenetic-kit

Elysium Index

Best for: Saliva-based epigenetic testing when you want a credentialed consumer DNAm product without a blood draw

About $299 with plan pricing; higher as a one-off in some offers Battery: 1 days Often cheaper with Elysium membership — membership not required to understand the product Amazon

Index is the saliva epigenetic on-ramp: less blood-draw friction, still a methylation story. Use it for trends, not as a doctor substitute.

Saliva DNA methylation kit.

Epigenetic clocks estimate aging from DNA methylation patterns; newer pace metrics aim to track rate of aging rather than only a static age.

Index is the saliva epigenetic on-ramp: less blood-draw friction, still a methylation story. Use it for trends, not as a doctor substitute.

Pros

• +Saliva collection
• +Consumer epigenetic access
• +At-home kit

Cons

• -Membership pricing complexity
• -Not a medical diagnosis
• -Saliva vs blood tradeoffs

Choose this if

• Saliva-based epigenetic testing when you want a credentialed consumer DNAm product without a blood draw
• Saliva DNA methylation kit
• Readers who separate clocks from clinical care

Skip this if

• You specifically want DunedinPACE-class pace reporting as the headline metric
• You dislike membership-tied checkout math

Estimated ownership: about $350 in year 1 and $1,050 over 3 years. Plan pricing moves the number — budget the real checkout total, not the headline “from” price.

Function Health · Blood-panel

Function Health Comprehensive Labs

Best for: Broad annual blood work with longevity-clinic UX — biological age as a summary, not the whole product

About $365–$500/year membership class pricing (offers vary) Battery: 2 days Membership model for broad lab access — annual cadence is the product

Function-style comprehensive labs are a longevity bloodwork membership more than a clock. Buy them for biomarker coverage and trends — treat any biological-age badge as optional narration.

Broad lab membership panel.

Blood chemistry panels estimate aging risk and “inner age” from clinical labs — highly actionable, different science than epigenetic clocks.

Function-style comprehensive labs are a longevity bloodwork membership more than a clock. Buy them for biomarker coverage and trends — treat any biological-age badge as optional narration.

Pros

• +Wide biomarker coverage
• +Annual trend potential
• +Clinic-like convenience

Cons

• -Membership required for the product model
• -Not epigenetic DNAm
• -Bio-age summaries are secondary

Choose this if

• Broad annual blood work with longevity-clinic UX — biological age as a summary, not the whole product
• Broad lab membership panel
• Readers who separate clocks from clinical care

Skip this if

• You only want a one-time epigenetic kit
• Your clinician already orders equivalent labs cheaper

Estimated ownership: about $500 in year 1 and $1,500 over 3 years. Annual membership estimate — confirm current inclusions before buying.

myDNAge · Epigenetic-kit

myDNAge

Best for: Horvath-clock-lineage epigenetic age when you want a classic methylation age estimate

About $250–$320 depending on sample type and offer Battery: 2 days No required membership — kit purchase

myDNAge is the classic epigenetic age lane: a Horvath-associated clock story without the full multi-metric dashboard of newer COMPLETE products.

Classic epigenetic age kit.

Epigenetic clocks estimate aging from DNA methylation patterns; newer pace metrics aim to track rate of aging rather than only a static age.

myDNAge is the classic epigenetic age lane: a Horvath-associated clock story without the full multi-metric dashboard of newer COMPLETE products.

Pros

• +Horvath-lineage positioning
• +At-home kit options
• +Clear bio-age framing

Cons

• -Less pace-of-aging focus than newer kits
• -Not a medical diagnosis

Choose this if

• Horvath-clock-lineage epigenetic age when you want a classic methylation age estimate
• Classic epigenetic age kit
• Readers who separate clocks from clinical care

Skip this if

• You specifically want pace-of-aging as your primary longitudinal metric
• You need organ-system age breakdowns

Estimated ownership: about $300 in year 1 and $900 over 3 years. Assumes roughly one test per year.

Tally Health · Epigenetic-kit

Tally Health TallyAge

Best for: Cheek-swab epigenetic testing with a consumer longevity brand experience

About $200–$250 per test; membership bundles change totals Battery: 2 days Often sold alongside Tally membership and products — evaluate the test separately

TallyAge is the cheek-swab bio-age product for people who want epigenetic theater with minimal collection hassle. Keep membership upsells out of the scientific judgment.

Cheek-swab epigenetic kit.

Epigenetic clocks estimate aging from DNA methylation patterns; newer pace metrics aim to track rate of aging rather than only a static age.

TallyAge is the cheek-swab bio-age product for people who want epigenetic theater with minimal collection hassle. Keep membership upsells out of the scientific judgment.

Pros

• +Cheek swab convenience
• +Consumer-friendly UX
• +At-home kit

Cons

• -Membership ecosystem noise
• -Proprietary clock transparency limits
• -Not a medical diagnosis

Choose this if

• Cheek-swab epigenetic testing with a consumer longevity brand experience
• Cheek-swab epigenetic kit
• Readers who separate clocks from clinical care

Skip this if

• You want maximum algorithmic transparency and multi-clock reporting
• You refuse membership-tied brands

Estimated ownership: about $400 in year 1 and $1,200 over 3 years. Kit plus typical membership adjacency — your real total may exceed the test sticker.

Generic DTC telomere tests · Telomere-kit

Consumer Telomere Length Kit

Best for: Understanding a popular but weaker consumer aging metric — usually a skip for decision-making

About $89–$200 for many cheek-swab or blood telomere kits Battery: 3 days No required membership — kit purchase

Telomere kits sell a simple story. For personal decision-making they are usually the wrong biological age purchase — interesting biology, weak individual dashboard.

Telomere length consumer kit.

Telomere length relates to cellular aging biology but is a noisy individual metric compared with newer clocks and clinical biomarkers.

Telomere kits sell a simple story. For personal decision-making they are usually the wrong biological age purchase — interesting biology, weak individual dashboard.

Pros

• +Low sticker price
• +Easy at-home collection options

Cons

• -Noisy for individuals
• -Weak actionability vs blood or pace clocks
• -Easy to over-interpret

Choose this if

• Understanding a popular but weaker consumer aging metric — usually a skip for decision-making
• Telomere length consumer kit
• Readers who separate clocks from clinical care

Skip this if

• You want a metric that guides yearly lifestyle experiments
• You already struggle not to obsess over noisy numbers

Estimated ownership: about $120 in year 1 and $360 over 3 years. Curiosity spend — not a recommended annual protocol for most people.

How to interpret results without overreacting

1. Pick one primary method for trends. Do not score-shop across brands after every podcast.
2. Prefer pace and biomarkers you can influence over a single vanity age.
3. Retest on a schedule, same vendor when possible, after sustained changes — not after a three-day juice cleanse.
4. Translate to behaviors: VO₂ max work, strength, sleep, protein, metabolic health, alcohol, smoking — not just supplements.
5. Escalate medically when needed. A scary organ age on a wellness PDF does not replace clinical evaluation.

A practical testing ladder

1. Stage 0: sleep, training, grip, waist, blood pressure — free or cheap signals.
2. Stage 1: standard labs + DIY PhenoAge or a high-quality blood panel (InnerAge / Function-class).
3. Stage 2: annual epigenetic kit with pace reporting (NOVOS Age or TruAge COMPLETE).
4. Stage 3 optional: GlycanAge if inflammation/immune aging is a specific question; GrimAge-class reports if you want outcome-trained methylation without the fullest consumer dashboard.
5. Skip for most: telomere kits as decision engines.

Bottom line

Biological age tests are useful when you treat them as class-specific models — methylation clocks for genomic-regulatory aging patterns, blood scores for actionable physiology, glycans for immune/inflammation context. Start with blood literacy, add a serious epigenetic pace kit when the basics are stable, and refuse to let a single number become your identity. Related: Grip Strength as a Health Biomarker.

Next in Longevity: VO2 Max as a Longevity Biomarker — why cardiorespiratory fitness predicts outcomes and how to measure improvement.