Maybe we all start off as "normal", but things maybe out of our control can push us down a differant path before you even realise it, and by then it can be too late.
When I think of all the kids I knew in Primary school, they were all "normal", probably like most kids in most primary schools, you couldnt have ever imagined that the sweet little girl with the freckles and the plaits, playing Hopskotch and laughing innocently, would one day by a crack whore.
Or your friend Johhny, that you went catching Stiklebacks with would grow up to be a rapist.
Maybe the longer we are alive, the more cranky we get, the further we drift off the "straight and narrow".
Maybe a reason God limited our life spans so severely, so we dont stick around long enough to get really weird.