Heh, I kinda know what that's like. Hasn't been a problem much lately, but I know for the first while that I started buying alcohol, I got IDed all the time if I was clean shaven. Now they know me at the liquor store. lol
I've had a number of people tell me in the last while, though, even when clean shaven, that I look like I'm in my late twenties. Getting there, but not quite there yet.