I found a copy of FotR in my house when I was around 12. I liked it but just couldn't get past the part with Tom Bombadil, simply because it moved so ..s-l-o-w-l-y.. Then I saw the first two movies and loved them, and decided to read the books. Since I already had a basic idea of what was going on, I found them a lot easier to read, and I loved learning about all the things not in the movies. I simply couldn't wait to find out what happened in the end, so I read RotK very quickly (and nearly went mad trying to not leak out spoilers to my friends!). I've become much more of a disciplined reader since I was 12, so I went and read the Silmarillion and Unfinished Tales, and I'm currently reading the Lays of Beleriand. It's just interesting how differently I view the books now, because I now feel that I can really appreciate everything in them as opposed to being turned off to them because of the slow pacing. Long live Tom Bombadil!