I am also approaching my 40s, but really, it is true that when one ages, so many uncommon things failed spectacularly, after that, one assumes everything behaves like that. But I try to keep a fresh mind and kind of brainwash myself to think positively first. Played out very well until now. (Because a lot of young developers fresh out of uni are taking with them the conservatism of the professors or mediocre student teams.)