My DB is Oxbridge maths graduate. Yes he was freakishly good at maths from the start, bright all round but lazy, and maths just came so easily to him he focused on that.
He loves puzzles, and can whizz through a cryptic crossword without missing a beat.
He was also very talented at art as a child but never bothered really so it fizzled out.
In primary school he started taking apart computers and rebuilding them, got good at electronics. He loved computer games.
In secondary school his maths and coding skills just rocketed, he was lucky to go to a school with a strong maths department (but nothing much in IT, which he did all by himself at home).
He swanned into Oxford and was very comfortable, again didnt work very hard. He was brilliant at statistics but didnt even really like it. The laziness did him no favours, he got a 2:1 overall and then fell into an IT career. He now does a very complicated and highly mathematical job in IT software engineering, where he is handsomely paid for being utterly brilliant... and still doesnt work very hard. Because he is so bright and can visualise numbers and logic in a way normal people cannot, his managers don't realise he can do perfectly in a few hours what would take someone else days to figure through.
I wish I were as brilliant as him. I am a worker bee, so I've done ok for myself but I'd have really loved to have his smarts!