Alex, agreed re: risk. Hell, I DID take some pretty serious spills on my bike, with a chipped front tooth to show for it. No biggie.
In a lot of ways I think it's more important as an adult to worry about safety equipment than as a kid. My reflexes, reaction time, maneuverability, and ability to recover from injury are significantly reduced from what they were 20 years ago. Plus I have a longer way to fall with a lot more mass and momentum to increase the impact force.
But really the deciding factor for me is regularity. Most everyone is going to survive the occasional ride to the store or day of jumping over flimsy plywood ramps unscathed. But repeat daily over a long period of time, and one's odds of injury become less and less comforting.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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