When you’re young, it’s an easy trap to fall into- “This hurts.  I must have done something to it.  Oh, yeah, I fell off a skateboard.  I rode into a tree…”  That sort of thing.  Then, you get a few years on you, and things just start to hurt for no damn reason.  Or at least not a cool, fun, reason.  “Oh, I have a headache because the flexibility of my corneas suddenly diminished because evolution deems that I should be sabre toothed tiger poo by now and it doesn’t matter if my eyes falter and my knees sound like bubble wrap.”

Not cool.