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

Definition
The average length of life of a birth cohort.

In a period life table, it is the average length of life of newborn babies, assuming they experience the age-specific mortality rates of a given period throughout their life.

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

Example