I tend to think that if you’re old enough to read and enjoy something and not be bored by it, then you’re old enough to read it. I wouldn’t recommend Michael Moorcock’s Jerry Cornelius books for any 11 year old’s reading list, but I loved them when I was 11.
Neil Gaiman
Neil Gaiman is a badass and I would let him teach my children.
(Yes, that is my new metric of trustworthiness. No, none of the Republican candidates for president except maybe Gary Johnson would be allowed to teach my kids.)