"As a result, these populations are aging rapidly and face challenges in providing care and support to their growing ranks of older persons," Wilmoth said.
Wilmoth cautioned that "there is a great deal of uncertainty about population trends." He said projections could change based on the trajectories of three major components — fertility, mortality and migration.
Still, population growth until 2050 is all but inevitable.
The U.N. uses the "medium-variant" projection, which assumes a substantial reduction in the fertility levels of intermediate- and high-fertility countries in the coming years. In the "high-variant" — if women on average had an extra half of a child — the world population would reach 10.9 billion in 2050. In the "low-variant" — if women on average had half a child fewer — the population would be 8.3 billion in 2050.
Among the notable findings in the report:
• The population in developing regions is projected to increase from 5.9 billion in 2013 to 8.2 billion in 2050. In contrast, the population of developed countries is expected to remain largely unchanged during that period, at around 1.3 billion people.
• Africa's population could increase from 1.1 billion today to 2.4 billion in 2050, and potentially to 4.2 billion by 2100.
• The number of children in less-developed regions is at all time high at 1.7 billion. In those regions, children under age 15 account for 26% of the population. In the poorest countries, children constitute 40% of their populations, posing huge challenges for providing education and employment.
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