International records / Internet Archive

ERIC ED313284: Paths for Future Population Aging.

Population aging refers to an entire age structure becoming older. The age structure of a population is the result of three basic processes: fertility, mortality, and migration. Age structures reflect both past effects and current patterns of these processes. At the town, city, or regional level, migration becomes an important factor in raising the age level of the population, but in general the age structure of countries is more dependent on fertility and mortality. High fertility and high mortality ultimately produce a young population, while low fertility and low mortality in the long run p…