Healthspan is the number of years you live in good health, free of serious chronic disease and disability. It is different from lifespan, which is your total years of life. Globally people spend their last ~9–10 years in poorer health.

How is healthspan calculated?

We estimate your total life expectancy from age and sex, then subtract an estimated 'morbidity gap' — the years typically lived in poor health at the end of life. Healthy habits shrink that gap, a concept researchers call compression of morbidity.

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Healthy life expectancy (HALE) data: WHO Global Health Observatory.
Compression of morbidity: Fries JF, New England Journal of Medicine 1980;303:130–135.
Lifestyle effect on disability-free years: Li et al., BMJ 2020 (healthy years free of chronic disease).

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