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A friend of mine (who is 24, athletic, just has MIDGET feet) skis Dalbello Krypton Jak's - they're about the only 'youth' boot I've seen that is more or less just a shrunken version of the adults one. So could be worth a go... but if you're looking at AoS or SPK, based on the adult ones, I'm kinda assuming he has a reasonably wide foot.
And much as he might hate the suggestion, a high-performance womens boot might be on the money for him.