[ It sure seem to be troublesome to look like a child when you're probably not a child. But make her age too low and it'll be pointless to even get an ID. ]

Possibly; there are plenty of adults who look really young. You'll have to memorize a birthdate though, including year, and it'll probably be annoying to have people think your ID's fake. Not that it wouldn't be but still. It's not like we can get real IDs.