Evidence for a longer, healthier life
Longevity evidence,made useful
An original life-expectancy calculator and carefully sourced healthspan articles, with the assumptions and limitations shown.
Featured evidence
Study breakdown · Cell Reports Medicine, 2026
Three Hard Minutes vs Ninety Easy Ones
Short all-out efforts flood the bloodstream with different signals than a long, steady ride. That does not make Zone 2 obsolete. It does mean intensity is not a detail you can ignore.
Study breakdown · Eur Urol, 2016
Twenty‑One Times a Month
Men who reported 21 or more ejaculations a month had a lower rate of prostate-cancer diagnosis in the best prospective study we have. Twenty-one is a questionnaire bin, not a proven longevity protocol, and the signal is strongest for low-risk disease.
Latest thinking
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Verified supercentenarians · September 2026
What the Oldest Living People Keep Doing
A sourced look at the current GRG ranking of the world's oldest living people, the habits they describe in interviews, and the pattern that survives contact with evidence.
The longest study of happiness
Social Fitness: The Longevity Habit You Skip
The longest study of adult lives keeps landing on the same result: warm relationships predict happiness and healthy ageing. Here is what social fitness is, what to practise, what to stop doing, and how it shows up in mortality data.
Training · Strength
Muscle Needs Minutes, Not Hours
How little resistance training it takes to grow and keep muscle, what Dorian Yates and Steve Reeves actually did, and how to turn weekly sets into a realistic number of minutes.
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