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Life expectancy

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How Long Did People Use To Live?

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What is Life Expectancy?

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Life Expectancy Calculator - This is Britain with Andrew Marr - Preview - BBC Two

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Comparison: Illnesses Ranked By Life Expectancy

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Life expectancy to surpass 90 years by 2030

Life expectancy is a statistical measure of the average time an organism is expected to live, based on the year of its birth, its current age and other demographic factors including gender. The most commonly used measure of life expectancy is at birth (LEB), which can be defined in two ways. Cohort LEB is the mean length of life of an actual birth cohort and can be computed only for cohorts born many decades ago, so that all their members have died. Period LEB is the mean length of life of a hypothetical cohort assumed to be exposed, from birth through death, to the mortality rates observed at a given year.
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