Imagine 80% of the population is elderly and retired (or want to be retired) - that is where the world is heading by the end of the century.
From 2018: https://www.theatlantic.com/magazine/archive/2018/12/the-sex...
From 2022: https://www.theatlantic.com/magazine/archive/2018/12/the-sex...
Empty Planet: https://www.amazon.ca/Empty-Planet-Global-Population-Decline...