Actually, the survival curve of the population is "squaring" [1]. That means that even while the average age of the population is increasing, the age of the old

Actually, the survival curve of the population is "squaring" [1]. That means that even while the average age of the population is increasing, the age of the oldest is not increasing at the same rate. The consequence is that the recent increase in the ratio of younger to older people will not continue to increase at the same rate, and will plateau. This also means that increased immigration will increase the current ratio of younger to older but not increase the relative burden of the old later on. [1] https://i.imgur.com/ONRm4Ep.png https://i.imgur.com/ONRm4Ep.png