Which term describes population pyramids with a narrow base and broad top, indicating aging populations?

• A. Constrictive Pyramid
• B. Expansive Pyramid
• C. Stationary Pyramid
• D. Pyramid Type

Answer: (A)

Population pyramids use shape to reflect birth rates and aging. A narrow base with a broad top shows few new births combined with many older individuals, so the population is aging. This pattern is described as a constrictive pyramid. It signals low fertility and longer life expectancy, which shifts the age distribution toward older ages and leaves a smaller young cohort.

An expansive pyramid, by contrast, has a wide base and indicates many children and rapid population growth. A stationary pyramid is more rectangular, showing relatively constant numbers across age groups and slow growth. The term pyramid type is not specific enough to describe the aging structure.