Swartz: https://en.wikipedia.org/wiki/Aaron_Swartz
Tourist: https://en.wikipedia.org/wiki/Gennady_Korotkevich
George Hotz: https://en.wikipedia.org/wiki/George_Hotz
And really, the "teenage coding god" meme is just a specific instantiation of the concept of young prodigies. Terrence Tao, Mozart, Ramanujan, Bobby Fischer. So the claim that teenagers can't be competent at their art because of their youth seems silly.