Their population collapse with amplify this. Right now there are ~16 million persons in each age group 1 to 25 and 21 million in each age group 40 to 65. The population would be decreasing now if Mao had not killed off ~60 million people.

Unless they can undo the damage of the one-child policy and return to a fertility rate of at least 2.2 from their current 1.7 children per woman, they will lose at least 500 million people by 2100