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Someone who climbs mountains every week is less likely to be hurt in a given mountain climbOn any given mountain climb, maybe. But overall? I don't know. A coworker of mine who liked mountaineering made lots of acquaintances in that lifestyle, and he told me they are often missing limbs and show lots of ugly scars, and have lots of near-death anecdotes about themselves. I'm talking about people who do this either for a living or as an all-consuming lifestyle, not casuals.
He told me of a girl, a pro mountaineer, who was missing several fingers and had plenty of teeth knocked out. Her skin looked terrible, too. And he told me this is common. Her boyfriend was also a mountaineer, because that's yet another common fact: mountaineers band together, it's difficult to be in a couple with one if you don't find that lifestyle fascinating.
Another friend who does parachuting (from airplanes) told me he knows lots of people who do BASE jumping (or even worse, those senseless "wingsuit" jumpers) and they tend to die young. They do a lot of it, always chasing a more extreme high, until one day they simply don't make it.