I think age is one of a bunch of factors. I don’t think it’s directly related though. I’d argue you actually get happier assuming youve been making moves to improve your life/position while aging. Not having done so could be a double wammy though. Then shit is not improving and you blame yourself (potentially rightfully) for that. Maybe in the 80+ category but it should for the most part just mostly improve or plateau from idk like 25-30 up.