Definitely over a hundred, probably something more like 300. I've been reading ever since I was very young and I'm 23 now (I remember reading the Star Wars EU Thrawn Trilogy when I was ten or so, and I was reading before that as well. I'm not gonna count Goosebumps, though. I had nearly all of those but gave them away a few years ago). I kept most of my college textbooks and just read a lot in general. Now, with Kindle, my library is expanding even more rapidly. It's a joy being about to read outside without the hassle of holding pages down (especially at the beach, man was that a hassle).