"Thanks to a combination of growing longevity and falling birth rates, the average age of populations, first in the world’s rich countries and, after a time lag, in emerging nations too, has been rising inexorably. By 2050 the world will have about 2 billion people aged over 60, three times as many as today. In parts of the rich world, mainly Japan and western Europe, that age group already makes up nearly a quarter of the population. By 2050 their share will rise to 30-40%, and even in the—much younger—developing world it will go up to 25-30%."I think this underestimates both the total number of people and the elderly fraction -- mainly because longevity technologies -- or gerontech -- will reduce the death rate and thus shift survival curves dramatically.
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