Average number of years that a person born in a particular year can expect to live.

demography

birthrate

fertility

mortality

death rate

infant mortality rate

Life Expectancy

The correct answer is: "life expectancy".

Life expectancy is a demographic indicator which measures the average number of years that a human being is expected to live, depending on factors such the date and place of birth, fhe age at the moment, the gender, where this person lives and degree of development of such region, etc.

The most common calculation consists on computing life expectancy at birth.