I'm about to turn 60 but I like these crocs, they're comfortable, quick to slip on and off and the dark green crocodile skin looks cool(?) or funky(?) or whatever, but I like them so I don't care if people think I'm too old to wear them.  My wife hasn't commented on them so I don't know what she thinks.  I guess she's seen worse on me.  This is my third pair of crocs, the other two pair are more conservative and appropriate to my age but just as comfortable although not as much fun to look at.