I got my black belt in TKD as a kid so good luck to your son, hopefully he sticks with it.
I hope he has better luck with instructor longevity than I did. When I was a kid my sensei moved before I could get through a black belt in karate. In college my sifu graduated before I could finish my black belt in wushu and then I graduated before I could get very far in tai-qi.
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I think he will. He loves TKD.
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