It happens to just about everyone. Sometime in your early to mid-teen years, you wake up one day and realize that, gradually, every adult you know has become a stranger to you. You have begun to understand the fears, jealousies, and appetites that really motivate grownups, and you are appalled. They in turn suddenly do not recognize you as the child they have harbored lo these many years. And so your life becomes a series of surreptitious forays punctuated by skirmish - if your paths cross, there will be conflict, so you do your best to skirt their presence, to avoid their taint. You forge alliances with your friends or toughen up and go it alone, hoping against hope that you will make it.
Hmm. Maybe I'm overstating it. It's been a while, after all - all I can remember is being truly freaked out when my father threw my Kings of the Wild Frontier LP down the stairs because, I think, he was afraid I was on drugs. And my own kids won't be prompting me to mystifying moments of violence for a good 5 years yet.
Charlie Higson certainly sees adolescence that way, though. In The Enemy, all the grownups have turned into zombie-like cannibals. Some plague or something. The kids live in fortified big box stores and send out foraging parties to look for food and weapons. Yup. It's excellent.