If I were a child interested on becoming a mathematician, when should I start learning proofs?

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I've been trying to start with mathematics from "scratch", but I do not rely on my foundations. I want to be a mathematician, so I picked this book "Basic mathematics" by Serge Lang and I picked up on that fact I requires proof-knowledge. So, if it's "Basic mathematics" that means that I would be highly encouraged to work through a book on proofs beforehand just start learning from there without stop reading arithmetic books or something. And then get on with Lang's book. What do you think?