In the past, there were 20 times more children than older people. then there were 7 times more people under age 15 than over age 64. currently, there are 3 times as many children as there are elders. these changes in the age make-up of the population are referred to as a

"demographic shift"

Explanation:

According to my research the changes in the age makeup of the population as shown in the question are referred to as a "demographic shift". This phenomenon of theory as some may call it is when the demographic goes from a population with high birth rates and high infant death rates to a population of low birth rates and low death rates. Leading to statistics like those shown in the question.

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answer; inductive techniques;

i honestly have no idea