I'm 31 and I usually still feel young and fun (though not really hip; I've never been really hip). But watching the Olympics is making me feel old! Especially these tiny gymnasts who were born well into the 90s!

I feel the same way when I watch college basketball and when I watch certain TV shows when almost the entire cast is younger than I am (like Happy Endings!).

How about you? What, if anything, makes you feel old?