Biological Age Calculator
Estimate your biological age — the age your cells and body systems actually measure, which can differ from the date on your birth certificate. The science behind it reads DNA methylation, telomere length, and functional markers like VO2 max and grip strength; this tool approximates that from the inputs that move those biomarkers.
How to use this calculator
Enter your current age and work through each lifestyle and health factor. Each radio selection adjusts your estimated biological age in real time. The goal is to have a biological age lower than your chronological age.
Understanding biological age
Biological age reflects how well your body is functioning relative to population norms for your chronological age. It is shaped by lifestyle, environment, and genetics. Unlike chronological age, biological age can improve — studies using epigenetic clocks show measurable reductions in biological age within weeks of sustained lifestyle changes. This estimate is not a clinical measurement but reflects the weight of evidence from large-scale lifestyle research.
Frequently asked questions
Biological age biomarkers explained
Researchers use several measurable biomarkers to estimate biological age. Each reveals a different aspect of how the body is aging at a cellular and functional level.
| Biomarker | What it measures | Ideal range | Test cost |
|---|---|---|---|
| Telomere length | Cellular aging — shorter telomeres = older cells | Above median for your age | $100–$300 |
| VO2 max | Cardiorespiratory fitness and heart age | >40 ml/kg/min (men), >35 (women) | $150–$400 (lab test) |
| Grip strength | Muscle function; predicts 10-yr mortality | >40 kg (men), >25 kg (women) | Free with dynamometer |
| Resting heart rate | Cardiovascular efficiency | 50–70 bpm | Free (watch or manual) |
| Blood pressure | Arterial health and cardiovascular stress | <120/80 mmHg | Free (pharmacy) |
| Fasting blood glucose | Metabolic health and insulin sensitivity | <100 mg/dL | $10–$30 (lab) |
| Epigenetic (DNA methylation) clock | Gene expression age — most accurate biological age test | Match or beat chronological age | $200–$500 |
How epigenetic clocks measure age
The most precise way to read biological age is not a questionnaire but a chemistry readout of your DNA. Over time, methyl groups attach to and detach from specific sites on the genome in a remarkably predictable pattern. Epigenetic clocks measure the methylation level at hundreds of these sites and run them through an algorithm trained against known ages, producing an estimated biological age from a single blood or saliva sample.
- ·Horvath clock — the original 2013 multi-tissue clock built on 353 methylation sites; estimates how old your cells look across nearly any tissue type
- ·PhenoAge — trained on clinical biomarkers as well as methylation, so it tracks disease and mortality risk more tightly than chronological age alone
- ·GrimAge — the strongest current predictor of time-to-death and disease onset; it estimates methylation surrogates for plasma proteins and smoking history
- ·DunedinPACE — reports a rate of aging (how many biological years you accrue per calendar year) rather than a single age snapshot, making it sensitive to recent change
What "reversing" biological age means at the cellular level
Lowering biological age is not a metaphor — it is a measurable shift in the biomarkers above. The lifestyle inputs in this calculator matter only insofar as they move those readouts, so frame any change around the marker it affects rather than as a generic habit checklist.
- ·Telomere attrition can slow — sustained stress reduction and exercise are associated with preserved telomere length on repeat sampling
- ·Methylation patterns can shift younger — small trials report epigenetic-clock reversals of one to three years after several weeks of combined diet, sleep, and exercise change
- ·VO2 max can rise — a functional marker of cardiorespiratory aging that improves measurably with Zone 2 and interval training
- ·Grip strength can be rebuilt — resistance training raises this population-validated mortality predictor at any age
- ·Glucose variability can flatten — a continuous glucose monitor shows metabolic age responding within days to dietary change
Biological age tests available today
If you want to measure your biological age directly rather than estimate it, these tests are commercially available with varying levels of accuracy.
| Test type | What it measures | Accuracy | Approximate cost |
|---|---|---|---|
| DNA methylation clock (e.g. TruAge, Elysium) | Epigenetic age via blood or saliva | Highest — R² ~0.95 vs chronological age | $200–$500 |
| VO2 max test (cardiology lab) | Cardiorespiratory fitness age | High for cardiovascular biological age | $150–$400 |
| Grip strength dynamometer | Muscular aging and mortality risk | Moderate — strong population-level predictor | Free–$50 |
| Comprehensive metabolic panel | Glucose, liver, kidney, lipid health | Moderate — reflects metabolic age | $30–$100 |
| Telomere length test (Life Length, TeloYears) | Cellular aging via telomere attrition | Moderate — high variability between cells | $100–$300 |
| Continuous glucose monitor (CGM) | Real-time metabolic response to food | High for metabolic health tracking | $70–$150/month |