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Built on the minimal clock of cremage.app and the United Nations World Population Prospects.

Lifestyle

When Will I Die Test

How long are you likely to live, and what are you most likely to die of?

The When Will I Die Test estimates how long you are likely to live. It starts from the United Nations life tables for your country, age and sex. It then adjusts them with a published biological age clock, which reads your health the way a mortality study would, and with large studies of exercise, alcohol, diet, sleep, social life, education and family history.

You get an expected age with an honest range around it, your biological age beside your calendar age, and the three causes of death that are most likely in your case. The test is for curiosity and education and is not medical advice. To take it, answer the questions below.

Question 1 of 18

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Most lifespan quizzes add and subtract years by rule of thumb. This one is built the way an epidemiologist would build a rough estimate, from published tables and studies, and it says where each number comes from. It has four parts.

The baseline is the 2024 revision of the United Nations World Population Prospects, which gives death rates for every age, both sexes and 237 countries and territories, with projections to 2100. The test follows your own generation through those tables: your death rate at 70 is the rate projected for the year you turn 70. Official life expectancy figures instead freeze today's death rates, so they come out lower, by several years for a young adult. Your result shows both.

The biological age comes from the minimal clock published at cremage.app by Crémieux Recueil. It is a survival model fitted on adults in the United States National Health and Nutrition Examination Survey whose deaths were followed to 2019, and it turns twelve inputs into the age at which a typical person carries your risk of death. Smoking, diagnosed conditions, general health, weight and blood pressure are things you know, and the test asks for them. The other inputs are routine blood and urine tests, which it does not ask for: the clock fills in the values typical of someone with your other answers, as its own calculator does when they are left blank. Your biological age therefore comes from your answers alone and is a broader estimate than one with real test results. With all its inputs measured, in surveys it was not trained on, the clock ranked who would die with an accuracy (AUC) of 0.82 to 0.87.

Habits the clock does not measure are added from pooled studies and meta-analyses: exercise (661,000 adults), alcohol (107 studies), fruit and vegetables (95 studies), sleep, social isolation (90 studies), education and how long your parents lived. Body weight is scored the same way, from 239 studies of never-smokers. These factors overlap with one another and with what the clock already measures, so their combined effect is cut in half before it is used. That is a judgement, not a measurement, and it errs on the side of caution.

The causes of death start from United States death certificates for 2019: what share of deaths at each age, for each sex, was due to heart disease, cancer, stroke and so on. Those shares are re-weighted with cause-specific models from the same survey data as the clock, so that a smoker's share of lung disease rises and a diabetic's share of diabetes does. They are then added up over the rest of your life, not just your current age, because what kills people at 25 is not what kills them at 85. Deaths from accidents and every other external cause are counted as one group.

The result has limits, and they are large. Nobody can know when one person will die: people with identical answers die decades apart, so the range matters more than the single number. The central estimate could itself be several years off. It assumes that your answers stay true for the rest of your life, that associations found in large groups apply to you, and that the United Nations projections come true. The clock was built on Americans aged 40 to 84, and the mix of causes is American, so both fit less well the further you are from that group. The test knows nothing about your genes beyond your parents' ages, or about anything that happens after today.

The When Will I Die Test is for curiosity and education. It is not a medical assessment and nothing in it is medical advice. If a result worries you, or a question reminds you of a check-up you have been putting off, a doctor is the right person to ask.

References

  • United Nations, Department of Economic and Social Affairs, Population Division (2024). World Population Prospects 2024, medium variant life tables.
  • Crémieux Recueil (2025). Clinical Clock Calculator: the minimal clock and its replication package. cremage.app.
  • Fong, S., Denisov, K. A., Nefedova, A. A., Kennedy, B. K., & Gruber, J. (2025). LinAge2: Providing actionable insights and benchmarking with epigenetic clocks. npj Aging, 11, 29.
  • National Center for Health Statistics (2021). Provisional and final counts of deaths for select causes of death by sex, age, and race and Hispanic origin, 2019. Centers for Disease Control and Prevention.
  • Arem, H., Moore, S. C., Patel, A., et al. (2015). Leisure time physical activity and mortality: A detailed pooled analysis of the dose-response relationship. JAMA Internal Medicine, 175(6), 959-967.
  • Zhao, J., Stockwell, T., Naimi, T., Churchill, S., Clay, J., & Sherk, A. (2023). Association between daily alcohol intake and risk of all-cause mortality: A systematic review and meta-analyses. JAMA Network Open, 6(3), e236185.
  • Aune, D., Giovannucci, E., Boffetta, P., et al. (2017). Fruit and vegetable intake and the risk of cardiovascular disease, total cancer and all-cause mortality: A systematic review and dose-response meta-analysis of prospective studies. International Journal of Epidemiology, 46(3), 1029-1056.
  • Yin, J., Jin, X., Shan, Z., et al. (2017). Relationship of sleep duration with all-cause mortality and cardiovascular events: A systematic review and dose-response meta-analysis of prospective cohort studies. Journal of the American Heart Association, 6(9), e005947.
  • Wang, F., Gao, Y., Han, Z., et al. (2023). A systematic review and meta-analysis of 90 cohort studies of social isolation, loneliness and mortality. Nature Human Behaviour, 7(8), 1307-1319.
  • Balaj, M., Henson, C. A., Aronsson, A., et al. (2024). Effects of education on adult mortality: A global systematic review and meta-analysis. The Lancet Public Health, 9(3), e155-e165.
  • Atkins, J. L., Pilling, L. C., Ble, A., et al. (2016). Longer-lived parents and cardiovascular outcomes: 8-year follow-up in 186,000 U.K. Biobank participants. Journal of the American College of Cardiology, 68(8), 874-875.
  • Global BMI Mortality Collaboration (2016). Body-mass index and all-cause mortality: Individual-participant-data meta-analysis of 239 prospective studies in four continents. The Lancet, 388(10046), 776-786.
  • Li, Y., Pan, A., Wang, D. D., et al. (2018). Impact of healthy lifestyle factors on life expectancies in the US population. Circulation, 138(4), 345-355.
  • Clarke, R., Shipley, M., Lewington, S., et al. (1999). Underestimation of risk associations due to regression dilution in long-term follow-up of prospective studies. American Journal of Epidemiology, 150(4), 341-353.

Frequently Asked Questions

How accurate is the When Will I Die Test?

It is as accurate as public data allows, which is not very accurate for one person. The biological age clock at its core correctly ranked who would die sooner in about 82 to 87 of 100 pairs of adults in surveys it had not seen, most of that from age itself. But ranking risk is not the same as naming a date: among people with exactly your answers, half will die outside the range you are shown. Treat the central figure as the middle of a wide spread.

What is biological age?

Biological age is the age at which a typical person has your risk of death. If you are 50 and your biological age is 45, your risk today is that of an average 45-year-old in the reference data. The test uses the minimal clock from cremage.app, which works it out from smoking, diagnosed conditions, self-rated health, blood pressure and weight. The clock also uses seven routine blood and urine tests; this test does not ask for them and fills in the values typical of someone with your answers.

Why is my estimate higher than the life expectancy for my country?

There are two reasons. Official life expectancy is counted from birth, and you have already survived to your current age. And it assumes death rates stay as they are today, while this test follows the United Nations projection that they will keep falling during your lifetime. Your result shows the figure with today's rates held still as well, so you can compare.

How are the causes of death worked out?

The test takes the share of deaths due to each cause at every age in the United States in 2019, re-weights those shares for your answers with cause-specific survival models, and adds them up over your remaining years, weighted by how likely you are to die at each age. The three largest named causes are shown. Accidents and all other external causes are counted together as one group.

Can I change my result?

You can change your answers, and the studies behind the test suggest which ones matter most: not smoking, staying active and keeping blood pressure down are consistently linked to longer lives. But the test measures associations in large groups. It cannot promise that changing a habit will add a given number of years to your own life.

When Will I Die Test

Why Use This Test?

1. Free. The When Will I Die Test is free and takes about three minutes.

2. Built on published data. It uses the United Nations life tables for your country, a published biological age clock and hazard ratios from large cohort studies and meta-analyses. Every source is listed on the page.

3. Honest about uncertainty. You get a range and not just one number, and the page says plainly what the estimate can and cannot know.

4. More than a number. The result includes your biological age, your three most likely causes of death and the answers that moved your estimate the most.