I have both (10-13ish) and both read almost constantly. Our son is the older one, read early and also very quickly, and that's set a tone for his siblings who now read a lot as well. Neither in that 10-13 age bracket above has trouble finding novels they enjoy from fantasy or adventure settings. There was an earlier period where we asked friends' teenagers to suggest book series, but these days our children seem to find their own novels during library sessions incorporated into their schooling.

Yeah, although my son had trouble learning to read and wasn't really reading at grade level until the end of second grade, by the time he was ten he was reading all kinds of different books that interested him without needing our suggestions. He did read some "young reader" books, but also read a lot of classic adult novels.