Maximum life span is the oldest possible age that members of a species can attain, whereas average life expectancy is the number of years the average newborn in a particular population group is likely to live.
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 like sex. The most commonly used measure is life expectancy at birth (LEB).
The CDC's estimates show that life expectancy at birth in the U.S. decreased to 77 years in 2020, down 1.8 years from 78.8 years in 2019.
Women fare better than men, with higher life expectancies. Overall, women in the US can expect to live 81.2 years, while men can expect to live 76.2 years, researchers said.
Life expectancy is determined by multiplying the sequence of the probabilities of survival at each age to determine the proportion of a population expected to survive to age x.
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