Well, I'm 39, I've been to the US twice in the past three years and been carded frequently when I was over there. I haven't been asked to prove my age that way in the UK, but I have had people my age assume I'm an average of a decade or so younger than them.
Funny, because when I was a kid people assumed, like Sora, that I was older. Then when I hit puberty, I matured early physically, but I still had the social/emotional awareness of someone much younger - disastrous! I spent much of my 20s trying to act a lot older than I was, and hating it.
Now, I suspect I'm still in a protracted adolescence. I dress, and am told I act, a bit 'teenage'. And a lot of the things that are supposed to be 'adult' concerns (having children, getting promoted, buying bigger and better Stuff) are really of very little interest to me.
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"Grunge? Isn't that some gross shade of greenish orange?"