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If a country's age pyramid has a narrow base but a very wide 20-29 age group, which explanation is most plausible?

Answer and explanation

Correct answer: Current low fertility combined with a large earlier cohort or young-adult immigration

The base of an age pyramid represents recent births and younger children. A narrow base therefore suggests that current fertility or recent births are relatively low. A wide 20–29 age group, however, represents a large cohort that was born earlier, or it may result from many young adults moving into the country.

These two features can occur together: current births may have declined while a previously large generation has reached young adulthood, or migration may have enlarged that age group. Extremely high current birth rates would normally widen the base, not narrow it. The statements about no elderly people or all children being 20–29 are plainly inconsistent. Thus A is correct.

Related tags

Age PyramidLow FertilityYoung AdultsImmigrationAge StructurePopulation CompositionGeographyClass 12 Mcq

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