 until maybe 12 or so, drop out, and then a new batch of 8 to 12-year-olds would come in. So stories didn't have to be particularly sophisticated. They didn't really need continuity that carried over from one month to the next. Stories could repeat themselves every few years because they assumed that the readers were new and hadn't seen them before. Characters like Batman and Superman, they were seen as very safe, very respectable books that any kid could read.