And you're right, you have to enjoy every chance to have fun because worries expand tenfold when you grow old and fun is harder and harder to get... I am always amazed when I look around me when I'm in clubs/pubs or at gigs. It seems that the people between 25 & 35 have all disappeared, like you're not supposed to live once you're in that faithful age bracket...
Most of them are now at home with kids or family, busy forgetting they once were young and non-caring.
There is no way it's going to happen to me anytime soon... Most of my friends grow old fast around me and it's a daily remember of how I DON'T want to become, ever. Party on my friend!