Hmmmm,
I certainly feel a lot older ie i get stiffer after exercise, generally more tired, slightly more conservative tastes etc, and definitely cannot handle half as much drink as I used to.
The weird thing at the moment for me is people when they guess my age now, say I look about 25, which I am, however they have been saying this since I was 16 and I don't appear to be looking any older, although my hair is a bit thinner it was very thick before, so no problems yet. Long may this state of affairs continue, not that i'm vain or anything
Really I think it is all relative to what you are doing, who you are around etc. At present I'm not really in a position to do half the stuff I used to because of work, and becuase i now have money, I save some for harder times etc, so have essentially been forced to grow up, and I think this happens to everyone eventually.
The weird thing I find is people who seem to WANT to grow up, like my girlfriend who is 23 and already talks about having children & buying a house etc etc............. this I find a little strange. Does anybody else?