*shrug* Maybe it's just me, then... I found, when I was 19 or 20, that if I wore my hair down and I wore a t-shirt and jeans, the probability of my getting carded was a lot higher than if I wore a nice shirt and slacks and put my hair up in a bun.
XO Princess's story reminds me of something that happened to one of my sorority sisters... she also looks really young for her age. She was sitting in the exit row of an airplane, and the flight attendant came up to her and asked her "Are you 15?" (Meaning, "are you at least 15") She was very puzzled (she interpreted it as "are you as young as 15") and said "well... no." So the flight attendant asked her to move! "Why?" "You have to be at least 15 to sit in an exit row." "Ummm... I'm 22." "...Oh." That poor flight attendant