howoldisyourbodyAt-home biological age test

Free · independent · 20 minutes at home

How old is your body, really?

Fifteen simple tests and questions, from getting up off the floor to your resting pulse, turned into a biological age and a life expectancy range using results from large population studies.

Take the free testSee the science
No sign-upNothing leaves your browserEvery number cites its study
Example result

Biological age

50yrs

2.3 years younger

Calendar age

52yrs

Male baseline

Estimated life expectancy

81vs 79 average · +2.0 yrs
0%25%50%75%100%506070809010050% alive at 82
Example profileAverage for age and sex

What you’ll need

Things most homes already have. If you’re missing one, skip that part; the test still works.

A sturdy chairFor timed chair standsno arms · ~17 in seat
Tape measureWaist, height, and a walking coursesoft tape is best
A stopwatchYour phone works0.1 s precision
Blood pressure cuffUpper-arm cuff, if you have oneavg of 2 readings
A step (optional)For the fitness step test~16 in high
Some floor spaceA hallway and room to sit down4 m / 13 ft 1 in

How it works

  1. Do the tests

    Follow the step-by-step instructions for each one. Most take under a minute, and you can skip any that don’t suit you.

  2. See your biological age

    Your results are compared with a typical person of your age and sex, then turned into the age whose risk matches yours, with a life expectancy range.

  3. Find your biggest levers

    The test ranks the changes that would move your number most, and gives you a one-page summary to bring to your doctor.

Fifteen measures in four areas

Each one has been linked to all-cause mortality in large prospective studies or meta-analyses.

10 min

Physical function

  • Sitting-rising test0–10 pts
  • One-leg stand10 s
  • Five chair standssec
  • 4-meter walkm/s
5 min

Body and vitals

  • BMIkg/m²
  • Waist-to-heightratio
  • Resting pulsebpm
  • Blood pressuremmHg
0–5 min

Fitness

  • VO₂max estimateml/kg/min
  • From pulse, a step test, or your watch
2 min

Daily habits

  • Tobaccostatus
  • Exercisemin/wk
  • Sleephrs
  • Alcoholdrinks/wk
  • Fruit & vegetables/day
  • Social connectionself-rated
Independent by design. No account, no tracking of your answers, and nothing to sell you.
  • PrivateThe test runs entirely in your browser. Your answers are never uploaded.
  • TransparentEvery hazard ratio, formula and assumption is published on the science page.
  • Honest about limitsIt’s an estimate from population averages, not a diagnosis. We show the range, not just a single number.

Built on published research

Hazard ratios come from these studies and meta-analyses, together covering millions of participants.

Brito · Eur J Prev Cardiol 2014Araújo · Br J Sports Med 2022Cooper · BMJ 2010Studenski · JAMA 2011Global BMI Mortality Collab. · Lancet 2016Zhang · CMAJ 2016Prospective Studies Collab. · Lancet 2002Kodama · JAMA 2009Jha · NEJM 2013Arem · JAMA Intern Med 2015Cappuccio · Sleep 2010Wood · Lancet 2018Wang · Circulation 2021Holt-Lunstad · Perspect Psychol Sci 2015

Twenty minutes. One number worth knowing.

Free, private, and you can retake it every few months to track your progress.

Take the free test