Term	Life Expectancy
Synonym	Expectation of Life
Related Term
Source of Definition	Population Statistics
Short Definition
Statistical Activity	Demography Vitals

Definition
The average length of life remaining at a given age.

In a period life table, it is the average length of life from a given age, assuming people experience the age-specific mortality rates of a given period from that given age onwards.

In a cohort life table, it is the average length of life from a given age, of people born in a given period, based on the mortality rates actually experienced by them from that given age onwards.

Example