Total fertility rate represents the number of children that would be born to a woman if she were to live to the end of her childbearing years and bear children in accordance with age-specific fertility rates of the specified year.

World Bank staff estimates based on age/sex distributions of United Nations Population Division's World Population Prospects

Total fertility rate represents the number of children that would be born to a woman if she were to live to the end of her childbearing years and bear children in accordance with age-specific fertility rates of the specified year.

Across the board in the countries with the highest GDPs in the world, fertility rates are declining.

Total population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship. The values shown are midyear estimates.

Asia and Europe are home to some of the world’s oldest populations, those ages 65 and above. At the top is Japan at 28 percent, followed by Italy at 23 percent. Finland, Portugal, and Greece round out the top five at just under 22 percent.

Southern Europe, which includes such countries Croatia, Greece, Italy, Malta, Portugal, Serbia, Slovenia and Spain, is the oldest region in the world with 21 percent of the population ages 65+.

Twelve percent of China’s population is age 65 or above. That share is 16 percent in the United States, 6 percent in India, and 3 percent in Nigeria.