It might be a good idea for him to retire before getting any major injuries which (I think) would subsequently slow him down or force him to retire like Dumont who's around the same age.
(I've posted this pic before) but he (or his twin) told me he had no plans of retiring.
Theoretically, he could kick on well into his 30s - more likely he'll get sick of snowboarding than retire.
It's not age that caps people's careers - it's injuries (and an inability to recover or overcome them) that forces people into retirement so they can finish on a high. Andre Agassi retired at 36. Also, having a break is a good idea.