I have a couple I wear.
I have one with Zelda on it...another that says "It will be a wonderful day when the schools have all the money they need and the air force has to hold a bakesale to buy a bomber." plus another couple. My son had one that said "I do my own stunts" (it fits him, he's accident prone) my DD has a couple cutsie ones that random relatives on DH's side bought us (I'm my Daddy's princess, I have my prince, his name is Daddy)
I don't see anything wrong with them, so long as they aren't totally offensive...and the "I'm so hott" shirts on 10 y/os bug me. I saw one on an older teen (I'd guess 16/17) that said "Jailbait" it made me
I bought my friends DH one that says "I do whatever the voices in my wife's head tell me to do."