Biological Age Estimate
See whether your habits are aging you faster or slower than the calendar. A lifestyle-based estimate across 8 health domains, updating as you move the sliders.
BMI 24.5
How to read this number
This is a lifestyle estimate, not a clinical measurement. Validated biological-age clocks (DNA-methylation tests like Horvath or PhenoAge) need a blood or saliva lab; this tool instead sums well-evidenced lifestyle effects into an illustrative year offset. The per-domain year figures are approximations (for example, resting heart rate is shown at roughly 1 year per 10 bpm around a 60-70 bpm reference), useful for seeing which habits help or hurt, not as a precise age.
Frequently asked questions
What is biological age?
Biological age is the idea that your body can be functionally older or younger than your calendar age. The most rigorous measures are lab-based DNA-methylation clocks (Horvath 2013, PhenoAge / Levine 2018). This tool gives a lighter, lifestyle-based estimate from habits and a few health markers, so two people the same age can land years apart.
How accurate is this estimate?
It reflects population-level associations, not a personal measurement. The direction is meaningful (which domains help or hurt), but the exact number is illustrative. For a validated reading you need a DNA-methylation test or a clinical biomarker panel. Treat this as a motivating snapshot of your habits.
Can I lower my biological age?
Habits clearly move the inputs here: more regular exercise, sleeping near 7-9 hours, not smoking, and less sitting all push the estimate down. Whether a DNA-methylation clock can be reversed is promising but early. One small uncontrolled pilot (Fitzgerald 2021, n=43) reported a few years of methylation-age reduction over 8 weeks; it is a starting signal, not settled science.
Which factor matters most?
In the underlying research, not smoking and regular physical activity carry the largest effects, followed by sleep in the 7-9 hour range, body composition, and stress. The domain bars show where you stand on each, sorted from your strongest to your weakest.
Learn more
Related tools
- Zhang D et al. (2016). Resting heart rate and all-cause mortality. CMAJ, 188(3):E53-E63. PMC
- Arem H et al. (2015). Physical activity and mortality (dose-response). JAMA Intern Med, 175(6):959-967.
- Sabia S et al. (2019) & Hirshkowitz M et al. (2015). Sleep duration and health. PLoS Med / Sleep Health.
- Wang X et al. (2014). Fruit and vegetable intake and mortality. BMJ, 349:g4490.
- Wood AM et al. (2018). Alcohol risk thresholds. Lancet, 391:1513-1523. Doll R et al. (2004). Smoking and mortality (50-year study). BMJ, 328:1519.
- Ekelund U et al. (2019). Sitting time and mortality. BMJ, 366:l4570. Levine ME et al. (2018), Horvath S (2013). DNA-methylation age clocks.
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