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In a region, the absolute number of elderly people remains unchanged, but the number of children falls rapidly. Why can the percentage of elderly people still increase?

Answer and explanation

Correct answer: The elderly share can rise because the total population decreases

The governing concept is the difference between an absolute number and a percentage share. The elderly percentage is calculated as elderly people divided by the total population, multiplied by 100. If the number of elderly people remains constant but the number of children falls, the total population may become smaller. For example, 20 elderly people in a population of 100 represent 20 percent, but the same 20 in a population of 80 represent 25 percent. Therefore, option A is correct. Option B is wrong because the elderly number need not double; options C and D ignore the importance of the denominator. This reasoning is central to interpreting ageing and age structure.

Related tags

Elderly PercentageRelative PopulationAge StructurePopulation AgeingPopulation CompositionGeographyClass 12 Mcq

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