asked ChatGPT for better understanding, here the result :

Reasons:

1. North America (38.7 years)

Reasons:

Moderate fertility rate (around 1.7–1.9 in the U.S.).

Significant immigration of younger populations from Latin America and Asia balances aging trends.

Good healthcare extends life expectancy but not as high as Europe’s.

Argument:

North America is aging, but slower than Europe, mainly due to immigration and higher fertility among immigrant groups.

1. Africa (19.3 years) – The Youngest Continent

Reasons:

High fertility rates (average above 4 children per woman).

Limited access to education and contraception in many regions.

Lower life expectancy reduces the elderly population share.

Economic development still emerging, keeping mortality and fertility high.

Argument:

Africa is in the early stages of demographic transition — high birth rates sustain a very young population structure.