I'm 37. In the past few weeks, I've been reminded, variously, that I'm getting on a bit, I'm no longer young, I will be slowing down, I won't be able to do the things I used to, theres no point in me going to the gym because I'm not going to make the Olympics at my age, I should give up doing up my older house and buy a new build, because at my age, I don't want to be doing stuff like that, I'm too old to have children now at my age (not that I expressed a desire to), it was just suddenly mentioned out of the blue in a conversation. And so on.
I don't feel any different at all!