I bet you have... When I was a kid, I was always getting hurt - falling off a bike onto gravel, walking down alleys barefoot and stepping on a nail, etc. - so I got them as a kid.
Mind you, it's something that most people don't have boosted as an adult, which we all should.
My husband does, though - because he'll get hurt on jobsites. Oh, and my son just got one recently, because of a work injury.

