Structure Age Log For Free

It is common in demography to split the population into three broad age groups: children and young adolescents (under 15 years old) the working-age population (15-64 years) and. the elderly population (65 years and older)

This is due to the fact that any -disparities in the mortality rates of a population are more likely a result of variations within the younger age groups (usually infants and children). There are generally three types of population pyramids created from age-sex distributions-- expansive, constrictive and stationary.

And while every population pyramid is unique, most can be categorized into three prototypical shapes: expansive (young and growing), constrictive (elderly and shrinking), and stationary (little or no population growth).

An age structure diagram is a model that predicts the population growth rate by a shape. It shows a comparative ratio of males to females and the bars show various age groups from infants to adolescents to reproductive and post-reproductive stages.

An age structure diagram for a stable population is shaped like a dome or a hill. Other terms for this type of growth include zero growth, stationary, and constant. A population that is declining has relatively few younger individuals. This pattern is seen in populations with low birth and death rates.

Demographics of the United StatesUnder 18 years22.2% (2021)18?44 years35.9% (2021)45?64 years25.2% (2021)65 and over16.8% (2021)17 more rows

The age structure is closely related to the birth rate, death rate and migration of a population. In the region with high birth rate, the proportion of children tends to be higher, whereas in the region with low birth and death rate, the percentage of elderly population tends to be higher.

Example of an age structure with a diminishing population People aged 30-44 (upper reproductive years) make up 19% of the population; people aged 15-29 (lower reproductive years) make up 15% of the population; and people aged 0-14 (pre-reproductive years) make up just 13% of the population.