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If the 0 to 14 group is declining but the 15 to 24 group is still large, which time-lag effect is visible?

Answer and explanation

Correct answer: Earlier large birth cohorts are still in youth ages

Age structure reflects the timing of births because people born in the same period move through age groups together as a cohort. A large group does not disappear when it leaves childhood; it appears later in the youth or adult categories. Thus different age groups can show the effects of births from different periods at the same time.

Here, the declining 0–14 group suggests that recent birth cohorts are smaller. The still-large 15–24 group indicates that cohorts born earlier were larger and have now moved into youth ages. This delayed appearance of earlier birth patterns is the time-lag effect. Therefore, option A is correct. Rising recent fertility would more likely enlarge the youngest group, not explain its decline.

Related tags

Cohort ProgressionYouth PopulationDemographic LagBirth HistoryAge StructurePopulation CompositionGeographyClass 12 Mcq

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