it all comes down to publicity. In snowboarding, they can afford to still publicize their older pros. In skiing, it seems to be a lot more cut throat, either you're the best, or latest and greatest, or you're jack shit.
but still, people like JP Auclair are truely at the top of their game now, because he is able to take into account every single aspect of skiing, whether it be park or BC and incorporate them into one smooth style. Again, also like Mike Douglas, who beat out all the other young park skiers in the K2 Back Nine.
All in all, no, its not shorter, its just less publicized.