I have the same issue, and it's very annoying that trying to register a child just gives a generic error message with no indication of the cause or solution. It just says, "Sorry, we're unable to accept your registration." (I tried to post a screenshot, but when I try I get another generic error message: "Permission Denied." And, when I tried to post this very message the first time I got an "Authentication Ticket Mismatched, failed authentication" message. Would it kill you to make these error messages the least bit informative?) If the original error message has just said "Users must be 13 or above" I could have saved an hour of digging for the solution. Deciding what my kid listens to is my prerogative, not Pandora's. And like any other parent, I'll probably create an adult account with my other email address and just let her use that, so rather than protecting kids you're just inconveniencing parents.
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