I'm in my 40s, so this is a way off for me - but I'm increasingly feeling genuinely anxious and scared of retirement.
I've watched the behaviour of both DP and PIL as they've given up work, and I desperately don't want to become like them. All four adults are alive and both mentally and physically healthy, so this is not dementia or any other kind of MH problem. But since retiring, they've become self-absorbed, selfish, unable to manage time, unable to organise themselves in any reasonable amount of time, fearful of totally norman things, and they've lost the capacity to empathise with other people almost completely. (My mother, of someone who is losing their child: "She's at the hospital by the bedside day and night, I mean what is the point?"). None of them seem to feel any need to be creative or to contribute in any way to the world (none of them have any childcare responsibilities).
They didn't used to be like this - so what on earth has happened? Is this normal? Please reassure me with stories about people who are retired and not like this - because the older people I can think of who I look at and think "Oh, I'd like to be like that" (Judi Dench!!) are all to some extent working.