"According to UN DESA World Population Prospects 2019, by 2050, 1 in 6 people in the world will be over the
age of 65, up from 1 in 11 in 2019.
All societies in the world are in the midst of this longevity revolution—some are at its early stages and some are
more advanced. But all will pass through this extraordinary transition, in which the chance of surviving to age
65 rises from less than 50 percent—as was the case in Sweden in the 1890s—to more than 90 percent at present
in countries with the highest life expectancy. What is more, the proportion of adult life spent beyond age 65
increased from less than a fifth in the 1960s to a quarter or more in most developed countries today.
These changes for individuals are mirrored in societal changes: older persons are a growing demographic group
in society. Older people account for more than a fifth of the population in 17 countries today, and the United
Nations Department of Economic and Social Affairs Population Division’s projections to the end of the century
indicate that this will be the case in 2100 for 155 countries, covering a majority (61 percent) of the world’s
population."
"Fiscal 50: State Trends and Analysis," Pew Research, October 17, 2019