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This assumes thew birth rate holds steady at what it is today (1.1 or something?).

My suspicion is that the birth rate will actually trend lower...

South Korea is already down to 0.78 https://www.npr.org/2023/03/19/1163341684/south-korea-fertil...

South Korea is Japan on speedrun lol.

I'd also suspect it doesn't take into account that medical and safety tech is likely only going to improve. If people live longer, the pyramid is going to become even more top heavy.

2055 is going to be the roughest. Eyeballing it looks like by then the current 'lump' of 45-50 will make it above 80, with not enough replacement of younger folks

Dating as an 80 year old man must be insane though with all the surplus women. I bet someone will cater to that specific market.

Considering that men die a bit earlier, at this point this man is looking for a nurse, not a girlfriend...

Wow that's pretty grim.

It actually gets better toward the end as the working age/pensioner ratio increases and average age decreases (visual estimation). It's getting over the "lump" that's gonna be painful.

That said there's no way the population will actually evolve like that...