Biological Age Estimate Calculator
Estimate a rough biological age by adjusting your chronological age for resting heart rate, activity and smoking.
How it works
biological age = chronological age + heart-rate offset (< 60 −2 / 61–70 0 / 71–80 +2 / 80+ +4) + activity (−3 / 0 / +3) + smoking (never 0 / former +1 / current +5), floored at 18
Biological age is the idea that people age at different rates, so two 50-year-olds can have very different health and risk. Formal versions use blood biomarkers, DNA methylation "clocks" or fitness testing. This is a simplified lifestyle estimate: a lower resting heart rate reflects better cardiovascular fitness and is linked to longer life, regular activity slows functional decline, and smoking accelerates it. It is a rough, educational indicator meant to show how modifiable habits nudge the number — not a validated clinical clock.
Worked example
A 40-year-old with a resting heart rate of 55 (−2), who is regularly active (−3) and never smoked (0) gets an adjustment of −5, for a biological age of about 35 — five years younger than their chronological age. A sedentary current smoker with a resting rate of 82 would instead add roughly 12 years.
Sources: Jensen et al., Resting Heart Rate and Mortality (Heart 2013)
Frequently asked questions
Is this a real biological-age test?
No. Genuine biological-age measures use biomarkers, epigenetic clocks or fitness data. This is a simplified educational estimate based on a few habits, useful for seeing how they influence the direction of the number.
Why does resting heart rate matter?
A lower resting heart rate generally reflects better cardiovascular fitness and efficiency, and large studies link higher resting rates to greater cardiovascular and all-cause mortality risk.
Can I lower my biological age?
You cannot change your birth date, but improving fitness, becoming more active, stopping smoking, sleeping well and eating a healthy diet all improve the health markers that biological-age estimates reflect.
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Educational estimate only — not a medical diagnosis or a substitute for professional assessment. Screening scores and reference values are population tools; they cannot judge your individual health. Discuss any concerns with a doctor, nurse or pharmacist.