Logo tees....?

I'm 19 , married, and a mother, and I still have and wear a lot of my logo tees from high school. You know, the ones with things like Tinkerbell, or a Rubik's Cube, things like the tees you get at WalMart that say snappy things. Am I too old to still be wearing these? I want people to not look at me and think I'm 12.