GRT 2100 Study Guide - Midterm Guide: Ken Dychtwald, Population Ageing, Cohort Analysis

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Lifespan is the fixed, finite maximum limit of survival for a species. Life expectancy is the average number of years a person is projected to live at birth or at a specific age (average life expectancy has increased in the past 50yrs) In developing or third world countries life expectancy is still quite low because of high infant mortality rates and the high illness percentage, as well as poor living conditions. Life expectancy differs by gender, culture, geographic location, ethnicity, race, personal habits, education, and birth cohort. Because of the diversity of genetic, environmental, and lifestyle factors, some individuals will die before reaching the average life expectancy for their group. Increased life expectancy is only part of the reason that the proportion of older people in society increase. Fertility rate has the most direct and largest effect in shaping age structure.

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