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Lifespan is the longest period of time a species can live. The human lifespan is measured in years. At the time of this post, the human life span is 122 years based on documented records of Jeanne Calment (1875-1997).
Life expectancy is different from lifespan. Life expectancy is the average time a species lives under certain conditions. In human studies, life expectancy is reported in years. Factors influencing life expectancy include diseases, sex, environmental variables such as pollution, and access to medical care.
On average, women live longer than men so life expectancy tables are reported by sex. Life expectancy changes for groups of people based on when it is measured. For example, the life expectancy at birth is different from the life expectancy of people alive at age 60.
See Assessment
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