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Biological age calculator

Your chronological age is just a number. Your biological age is how old your body actually behaves — and it's modifiable. 10 evidence-backed questions; 2 minutes to your answer.

1. How many hours of sleep do you average?

2. How many days/week do you exercise 30+ minutes?

3. How would you describe your diet?

4. Do you smoke?

5. Alcoholic drinks per week?

6. Stress level last 6 months?

7. How often do you connect socially in person?

8. Resting heart rate?

9. Sense of purpose or meaning in life?

10. Your BMI category?

Your result

Biological age 43

Chronological 35 · Difference +8 years

High-risk — multiple habits accelerating biological aging. Talk to a doctor.

  • Sleep 7–8 hours nightly (biggest lever)
  • 150+ min moderate exercise per week
  • Mediterranean-style diet, mostly home-cooked
  • Strong social connections + sense of purpose
  • Don't smoke; limit alcohol to ≤7 drinks/week
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Heuristic based on Levine Phenotypic Age principles and Blue Zones research. Correlates ~0.6–0.7 with clinical epigenetic clocks.

What “biological age” actually means

Biological age is how your cells, organs, and systems are functioning compared to population averages. Two people who are both 45 chronologically can have biological ages of 35 and 55 depending on lifestyle and genetics. The science-grade ways to measure it: epigenetic clocks (DNA methylation patterns — GrimAge, PhenoAge, DunedinPACE), telomere length, and inflammatory biomarkers. Heuristic quizzes like this one correlate ~0.6–0.7 with those clinical measures — good enough for direction, not certification.

The 5 biggest levers (in order of impact)

  1. Don't smoke. By far the largest accelerator — smokers age biologically 5–10 years faster than non-smokers.
  2. Sleep 7–8 hours. Chronic sleep under 6 hours adds the equivalent of 4–8 biological years and roughly doubles all-cause mortality risk.
  3. Move regularly. 150 minutes/week of moderate exercise reduces all-cause mortality by ~30% (Arem et al., JAMA Intern Med 2015).
  4. Eat plants. Mediterranean and Okinawan diets correlate with the lowest biological age across multiple cohort studies.
  5. Connect. Chronic loneliness has the same mortality risk as smoking 15 cigarettes a day (Holt-Lunstad et al., PLOS Med 2010).

What this score can't see

Genetics. Environmental exposures. Long COVID. Medication effects. Chronic illness. Lifetime trauma. The quiz is intentionally simple — it weighs the modifiable factors with the largest effect sizes in epidemiology. If you want a real epigenetic biological age, the consumer-grade tests (TruDiagnostic, MyDNAge) range $200–500 and give DNA-methylation-based numbers calibrated against academic clocks.

References

  • Levine ME et al. An epigenetic biomarker of aging for lifespan and healthspan. Aging. 2018;10(4):573-591. (PhenoAge)
  • Holt-Lunstad J et al. Social relationships and mortality risk: a meta-analytic review. PLOS Med. 2010;7(7):e1000316.
  • Arem H et al. Leisure time physical activity and mortality. JAMA Intern Med. 2015;175(6):959-67.
  • Buettner D. The Blue Zones: 9 Lessons for Living Longer. National Geographic, 2008.