It's counterintuitive, but if you look at eSports players, the prime years are much lower (both the start and the end). You do see 16 year olds at the top but you never see 30 year olds. It feels like the prime is really 16-25. Reaction times in traditional sports are not as important, and hands are one of the worst things to wear out. More parts != more wear out. There's a reason why there are (general) physical therapists and physical therapists who specialize in hands. Hands are incredibly complex and soft tissue injuries heal very poorly due to lack of blood supply.

I doubt the boredom thing is that different for sports vs eSports. At least with eSports the game is changing due to patches. With sports, the game itself hardly changes.

For citation: see https://journals.plos.org/plosone/article?id=10.1371/journal... you can see reaction time starts to drop off rapidly starting at age 25