I'm 18 and apparently, I look 12.
Last year, I went with my little sisters to go trick or treating and we stopped by this party place (it was like a mini carnival) and everyone was welcome so we went there and this old lady asked how old we were because she was giving candies to 15 years old and younger. She skipped my cousin who was 18 as well and she just walked towards me and asked me if I was 12?? She didn't even wait for me to respond and just gave me a candy and went ahead to the next person. I guess I have benefits from it too like when I buy season passes, I usually say I'm 12 LOL and they don't even bother checking my id or anything. I do get offended sometimes though because some people actually try to tease me about it like it's not even funny =_=