Not So Juvenile: Star Man’s Son / Daybreak 2250 A.D. by Andre Norton
I started intentionally looking for science fiction to read in elementary school. Our city library had one big room full of fiction for young readers, from preschool through high school, so I found books that were meant for readers older than I was — but I enjoyed reading them, even if I didn’t understand everything that happened to their protagonists. The top two science fiction writers, for me and I think for a lot of other people, were Robert Heinlein…