I was 24 when Freak Out was issued. Am I disqualified? Frank was a bit older - was he pandering to teens?
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Disqualified, no.
Overqualified, maybe.
The point that whoever said that was trying to make, I think, was that Zappa's music, almost all of it, is rooted in a bird-flipping type mentality that's never going to be able to chill out and enjoy the pleasures of "normalacy", if only in passing, and that's an attitude best accomodated by the adolescent and still freshly young adult. Not sure that I totally agree, but I certainly don't disagree.