On AskTSA, there is a tweet from a woman wondering why her 13 yr. old daughter got PreCheck and she didn't. She, of course, got a non-answer from TSA, alluding to pre-flight assessment.

Which makes me ask: what kind of a background check can be done on a 13 year old child in the first place? If the child committed some kind of a crime, there would be no record of it as juvenile records are normally sealed.