In developed countries, the population age distribution tends to be what shape?

In developed countries, the population age distribution tends to be what shape?

• A. Diamond shape
• B. Triangle shape
• C. Pyramid shape
• D. Irregular shape

Answer: (A)

The concept being tested is how the age structure of a population reflects fertility and life expectancy. In developed countries, birth rates are low and people live longer, so there are relatively few children, a large working-age population, and a notable but not overwhelming elderly group. When you lay out people by age, the bottom and the top are narrower while the middle is broader, creating a silhouette that resembles a diamond. This diamond shape signals an aging population with a concentration of people in the middle ages. In contrast, many developing countries have higher birth rates, producing a wide base of young people and a narrower top, which forms a pyramid or triangle. An irregular shape would suggest a mixed or unstable pattern without a clear demographic trend.

The concept being tested is how the age structure of a population reflects fertility and life expectancy. In developed countries, birth rates are low and people live longer, so there are relatively few children, a large working-age population, and a notable but not overwhelming elderly group. When you lay out people by age, the bottom and the top are narrower while the middle is broader, creating a silhouette that resembles a diamond. This diamond shape signals an aging population with a concentration of people in the middle ages.

In contrast, many developing countries have higher birth rates, producing a wide base of young people and a narrower top, which forms a pyramid or triangle. An irregular shape would suggest a mixed or unstable pattern without a clear demographic trend.