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Specifically, he kills the Lost Boys to stop them getting any older. Barrie writes: "The boys on the island vary, of course, in numbers, according as they get killed and so on; and when they seem to be growing up, which is against the rules, Peter thins them out; but at this time there were six of them, counting the twins as two." Whoa, no need. Also J.M. Barrie really needs to learn what full stops are.