Hell, with some sports and arts if you haven't already been doing it at least a year by age 7 and live (or move to) somewhere with one of a handful of teachers/coaches who are top-tier at teaching young beginners, and have parents able and willing to pay for lessons from them while you're still very young, you're never going to be truly great no matter how hard you try if you try to break into it starting at, say, age 14. It's my understanding that tennis and playing violin are both more-or-less like this, for instance. Gymnastics and some kinds of dance, too, I think. Like, if your kid's 10 and they aren't already damn serious about some of these things, you can just cross those possibilities off their list for the future.

Probably any sport or art in which people tend to peak very young (early 20s), or that have opportunities available for young participants that will effectively lock them out of further high-level advancement if they miss them (because you're expected to have done those if you're "serious"), are like that.