Inflation caused by a retired work force tends to correct itself - those retirees on a fixed income are incentivized to return to work.
Whether those retirees can successfully return to some form of work will often hinge on their country's health care system - not for the retirees, but for the middle-aged generated that will become retirees. That is where the United States is already running into issues.
China health care system is based on their single offsprings, that will be forced to shift hours from working/consuming to taking care of their elderly + offsprings.
8 Grandparents, 4 parents to take care on 2 working adults + 1 or more childrens. UnSustainable
Whether those retirees can successfully return to some form of work will often hinge on their country's health care system - not for the retirees, but for the middle-aged generated that will become retirees. That is where the United States is already running into issues.