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One year one account no derog probably 740-750 FICO 8 (assuming it counts on all bureaus).
He should get some of his own though now that he has a score.
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If he can go the secured route I'd pick up something useful like Discover or BOFA basically right now.
If not, hang out for six months to a year, at that point better options will open up but might want to check over on the CC forum as I really haven't kept track with the current UW guidelines of various lenders.
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