I think I was better than most kids at math, particularly algebra, but those kids grew up and caught up and I suspect many of them are as good or better at math than I am. I know nothing about child psychology or anything adjacent, but I honestly think a lot of "advanced child" stuff is just maturity.
ETA:
Should add that this carried on through high school, and since I finished my math two years early, I took college-level courses for math the last two years.