In 2018, for the first time in history, those aged 65 or older outnumbered children younger than five globally. And the number of people aged 80 years or older is projected to triple, from 143 million in 2019 to 426 million in 2050
The population aged 65 and older is growing faster than all other age groups, especially as the global birth rate has been plummeting since the second half of the 20th Century. According to the World Health Organization, fertility rates in every region except Africa are near or below what's considered the 'replacement rate' – the level needed to keep a population stable. In most high-income countries this hovers around 2.1 children per woman.