Old age?

I just turned 28.  I don't think that is anything big - most of my friends are older than me now and my age bracket does include 35 on most American forms.  However, I've noticed my age in the time I've been out here in California.  Take tonight for example.  A bunch of people are going to go out to dinner tonight at a Korean BBQ restaurant.  (That is still one thing I cannot get over, the sheer amount of choice in America)  A new episode of Glee is also on.  I'm torn about where I want to go.  I'm laughing though because when I was 20 and 21, living in the UK and Guatemala respectively, I went out EVERY NIGHT.  I think I took Sundays and Mondays off just out of sheer exhaustion.  When you are that young and can't drink at home, living in a country where you are an old fart on the drinking scene definitely helps.  Anyway, I was dead set on going out tonight, but I think I'll stay in.  It seems just as appealing to stay at home and enjoy the TV - maybe even more so.  Any thoughts on how we are getting "so old?"

PS.  It just blows my mind that I moved to Africa when I was 22 and moved back when I was 26.  3 years in Africa is 30 year over here?