I have no idea what's considered to be age-appropriate for kids anymore. I'm scared to buy books for my young relatives for fear of getting them something they "shouldn't" be reading. When I was a kid, reading anything at all was thought to be good. I brought all kinds of adult books into school. Nobody blinked. I suppose if I had something which was quite obviously erotica someone might have noticed, but otherwise I don't remember there ever being any issues.
Somewhat related is that yesterday I randomly noticed that Star Trek: The Motion Picture was rated G. Almost nothing not involving singing cartoon characters is rated G today.