I read that chidren are doing basically what they'll do for the rest of their lives before they're five years old.

Maybe so. I was horse and wildlife/bird crazy, raising baby chicks by myself, reading, writing in cursive, doing international travel, and playing the piano at five.
I still do most of that stuff, and teach English literature.

My daughter was riding a two-wheeler bike, rode her own little racking horse, was jumping rope and winning art shows at the Rowan County fair by the time she was four.
She's now a professional, fulltime artist with a gallery.

My son was able to make money at anything, was collecting fossils and reading stacks of paleontology books from the library at five. He became an entrepreneur, but not a paleontologist, although he sent fossils to the Smithsonian for evaluation.