Ask HN: Hobbies/Skills which can be picked in 30s and compete at world level?

What are some skills/hobbies you could start in your 30s and there are not many disadvantages to compete at world/regional level? Many physical things become difficult. Most of the other things statistically work out when you start as a kid. What are some sports, creative activities which don’t have to be your full time thing but still you could spend […]