[volkl48]

Russia: Eh, no. That's just a temporary blip caused by a lot of the people born before 1945 not having made it that far, so the population was unnaturally skewed young. Few elderly to be dying off at the time because a large portion of those people died off 50-60 years prior.

They're set for sharp decline going forward, and changes in geopolitics look likely to dry up or outright reverse their modest immigrant flows from former USSR countries.

Japan: Is shrinking ever more rapidly, not less.

[aylmao]

You're right. Japan's population pyramid is inverted [1]. Personally, I wouldn't call the rate ever more rapid— it's seems quite linear given that fertility rate has been pretty steadily around 1.3 since the 90s [2], but it is definitely still shrinking.

Russia's population pyramid does seem to suggest a big dip once the generation born in the 80s passes away, but it doesn't look like a reversed pyramid just yet. The generation born in 2021 doesn't seem considerably smaller than the one born 20 years ago [3].

[1]: https://en.wikipedia.org/wiki/Demographics_of_Japan#/media/F...

[2]: https://data.worldbank.org/indicator/SP.DYN.TFRT.IN?location...

[3]: https://upload.wikimedia.org/wikipedia/commons/e/e8/Russian_...