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Of all the titles that are in the above posts, is there any that you think are especially good for young adults or conversely not a good fit for that age group, 12-15?
fantasy: The Hobbit i'd consider required reading for a geeky kid who's into history and has some imagination. if they get through that then the 3 books after are also worth the read but harder for some kids. to me it was like a breath of fresh air because i love detailed history and world building kinds of imagination so i felt like i was coming home.
then you get to the Silmarillion which is more written from a more historical perspective but what really caught me too were the appendixes to the three books. that was the kind of reading i also enjoyed.
then after that i read anything anyone wrote about them including the Lost Tales and the entire series about the writing of and ... i've now long forgotten almost all of it. my noodle got full and needed to recycle...
science fiction: Dune for sure. i think anyone who likes detailed and expansive reading will get into that plus i love the ecological perspective. as a 10yr old i thought it was great and wished it had been a few hundred pages longer. the books after that one are also good and get strange but not as good, like many series things can go in strange directions.
like my other favorite author who hasn't finished a book in his series yet and everyone wants to strangle him for not getting it done. well, ok, i don't, but i'd like to read the last book before i kick the bucket.
and so on.
as for worrying about age appropriate, don't, kids will either not get it and won't care too much, but when "That Age[tm]" hits they'll start to get it and probably already know everything i mean c'mon it's not too hard to extrapolate from what animals do to humans... i don't think trying to protect them does any real good in the end. i knew more than both of my parents by the age of 9 than they did by the time they were 18. Mom's full "sex education lecture" was "Girls have indoor plumbing and Boys have outdoor."
anyways, it won't matter too much if they're exposed to things because they'll get exposed to it eventually. to me the important thing is that they know they are loved and that they can talk to you about anything.
my Mom though has a funny story about my grandmother asking her what a homosexual was. so she made it 70 or more years and 13 babies and managed to not catch on, but she was a busy little beaver... we still miss her.