That's at least partly because when we hit our 50's we're not quite so anxious to just huck it. You learn jumps faster ferinstance if you just attack them aggressively without concern for possible consequences. Of course in your 20's you're invincible, invulnerable, and immortal. When you hit your 50's you realize you're lucky to still be alive with some of the shit you pulled in your 20's.
I'm a far better snowboarder at 54 than I was a skier at 20. But it's taking me longer to get there because I think through each advance before hitting it.
And yeah, I'm amazed I'm still in one piece