how do different age groups influence the population growth? explain with the help of graphic representation
Answers
Answer:
sorry i cant add image for you
Explanation:
An important factor determining whether the population of a country increases or decreases is its age structure: the numbers or percentages of males and females
in young, middle, and older age groups in that population
Population experts construct a population age-structure
diagram by plotting the percentages or numbers of males
and females in the total population in each of three age categories: prereproductive (ages 0-14), consisting of individuals normally too young to have children; reproductive (ages
15-44), consisting of those normally able to have children;
and postreproductive (ages 45 and older), with individuals
normally too old to have children. presents
generalized age-structure diagrams for countries with rapid,
slow, zero, and negative population growth rates.
A country with a large percentage of its people
younger than age 15 (represented by a wide base in Pigure 6-11, far left) will experience rapid population growth
unless death rates rise sharply. Because of this demographic
momentum, the number of births in such a country will
rise for several decades even if women have an average of
only one or two children each, due to the large number of
girls entering their prime reproductive years.
In 2012, about 26% of the world's population-29%
in the less-developed countries and 16% in moredeveloped countries-was under age 15. By 2025, the
world's current 1.8 billion people under age IS-roughly
one of every four persons on the planet-will move into
their prime reproductive years. The dramatic differences
in population age structure between less-developed and
more-developed countriesshow why most
future human population growth will take place in lessdeveloped countries