I mean, this happened before and it always happens when a civilization reaches a plateau in their growth. People in the west started having less kids in the 70s so it's normal that there are less births now, because there are also objectively less people.
Yes, but there is nothing that you can do to sto it. As I said in the other comment, the real problem of today is the mass of old people who need 24/7 care. If majority of the population was still between 20-50 population decline wouldn't be as much of a problem
@RikaDerufu@LukeAlmightyThat's a healthcare issue, not a pension issue. Although they are related in terms of the famous "your contribution and expenses to the government relative to your age"-graph.