I'm old. Or more accurately old enough that I don't run out to party it up every Friday and Saturday night anymore. I'm also with the same chick for 20 years so we don't exactly have dates every weekend either.
Plus I've always been more of a Sunday funday kinda guy, if I'm being totally honest. My idea of a good weekend is to relax Friday after work, get some stuff done on Saturday and have a nice meal in the evening, and then hit the golf course Sunday morning around 730am, and the bar by 11am. Drunk by 2pm and home by 4pm for another good meal and the Sunday night HBO/Showtime lineup.
Action packed, I know. But hey, if you weren't a loser in your 20's/early 30's, you should have pretty much gotten it in by that time. The age I'm at now is the time to be responsible and plan ahead for the next fun chapter of my life that starts in my late 50's.