Completely agree about the birthrate needing to decline, however Japan is in a worse position due to Japan’s fertility rate stands at 1.3, while the United States is at 1.6. US also some what plugs the gap with significantly higher legal and illegal immigration than Japan. Japanese tend to live longer as well. So they are ending up more lopsided than the US when it comes to age spread.
Completely agree about the birthrate needing to decline, however Japan is in a worse position due to Japan’s fertility rate stands at 1.3, while the United States is at 1.6. US also some what plugs the gap with significantly higher legal and illegal immigration than Japan. Japanese tend to live longer as well. So they are ending up more lopsided than the US when it comes to age spread.