Its in not Just China but South East Asia like Thailand, Vietnam and rest will quickly face collapsing demographics.This is the fate of all of China unless CCP starts to really focus on birth rate increase with policies such as childless tax and no promotion to childless type of things.
Even official statistics maybe optimistic. Think over the post 1945 world and my favorite topic that has both the wealth and access to intelligence and they do research about things where things get wrong. They naturally had high expectation from Japan but they are too polite to publish it on mainstream. I think Putin has good idea about all those things as he brought Japan second time five years later and what ever he is doing it meets 21st century Arabic standards.
Putin on the causes of the demographic decline: Our former ambassador to Japan told me. We were driving in the car, and I said: why is the situation here like this, including with the birth rate? He said: young people under 35 here have no friends and don't want any. That's where the birth rate comes from. One of the former prime ministers of Japan, we were sitting, drinking sake, and he said: maybe our sperm is somehow different? What does sperm have to do with it? Everything is about the same. The issue is in the state of society.
05 September 2019,
Video: Putin Jokingly Compares Birth Rates in Japan and Chechnya with Dagestan