Not only early retirement but any kind of retirement that gets the retiree in a mode that they don't have to try anymore will result in cognitive decline. I am seeing this in my dad who has been retired for ten years now. Throughout his work life he was a sharp hard working banker. Now he uses his age and retirement as an excuse for not trying. Just yesterday he wanted me to order something for him from Amazon. I tol…
I guess this is why you should work less hard and do more to cultivate hobbies. I can’t imagine retiring and doing nothing. So many projects.
Perhaps there's some threshold of 'vegging' that isn't obtained if one has enough hobbies.