I think the most important thing in these cases is to know your kid and their maturity level and to be involved in their reading process. By that I mean know what they're reading, read it yourself, and be available to discuss concepts and events and answer any questions your kid may have regarding their reading. I was like you, when I was growing up I read whatever I wanted without restrictions. My parents weren't involved though. They didn't know what I was reading and didn't care. I was pretty mature and was able to handle whatever I picked out but I also think it would have been nice to have a close enough relationship with my parents to be able to ask questions if I'd had them.