The exception to explain would seem to be developed Asian countries. Why does Japan not see a similar decrease? They have a bunch of very significant societal

The exception to explain would seem to be developed Asian countries. Why does Japan not see a similar decrease? They have a bunch of very significant societal and dietary differences that already contribute to high longevity. But you could compare “menial tasks” and see if that can explain some of the shift too. I’m guessing you’d see that Japan’s levels of menial tasks shifted in the same way as the western countries, but they didn’t see a similar change in dementia. That’s just based on my mental mode of effects here, would love to see some more analysis though.