I'm 32 and no one ever believes me. They always think I'm 26 or 27. And it is GREAT now, but when I was 20 and I'd say "I'm a sophomore"" and they assumed I meant High School, it was very frustrating. And I am TALL (5'9) and have been this tall since 8th grade, so I always thought that would work to my advantage with people thinking I was not 12, but apparently not, lol.
Now it is great though. Nothing like knowing you're fast approaching 35 and still get carded from time to time!

Amy