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Level 4

Chapter 4

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Age Structure
The distribution of people across various age cohorts
Baby boomers
The generation of Americans born between 1946 and 1964
Child Dependency Ratio
The number of persons younger than 18 relative to those of working age
Demographic Transition
The shift from high mortality and fertility to low mortality and fertility that causes population aging' occurs in three stages
The Study of the basic population processes of fertility; mortality; and migration
Echo Boomers
The generation of Americans born between 1977 and 1994
Elderly Dependency Ratio
The number of persons aged 65 or order per 100 persons of working age
Fertility Rate
A measure of the incidence of births or the inflow of new lives into a population
Life Expectancy
The average number of years people in a given population can expect to live; the mean age at death; a measure of the combined outcome of many births and deaths calculated by taking the sum of the ages of death of all individuals in a given population
Life Span
The longest number of years any member of a species is known to survive
The movement of people across borders
Mortality Rate
The incidence of death in a population
Population Aging
Occurs when the proportion of older people relative to younger generations increases; a term that refers to an increase in the proportion of people 65 or older
Population Pyramid
A bar chart that reflects the distribution of a population by age and sex
Race Crossover
Among the oldest-old, the mortailty rate for African Americans falls below that of whites
Sex Ratio
The ratio of males to females; determined by the number of male relative to females at birth and by different survival rates over the life course
Total Dependency Ratio
The combined ratio of children and older people to workers