Nowadays Japan’s fertility rate is higher than most of its neighbours. We are just used to pick it as an example because it started aging earlier than most other countries.
Japanese population is still over 120 million. Forecasts put it falling below 100 million at some point in the second half of this century.
Things will have to change in order to keep population stable in the long term, but the Japanese approach seems IMHO more sensible than that of other countries.
Cohesive democratic societies are fragile.