Hmm. I've often read posts about tastes changing. This is not something I've experienced myself; I still like mostly the same genres and types of books I've always liked, even as a teenager (there are a few exceptions - I no longer read children's books, and I had a period in my late teens/early twenties when I devoured classics, something I later permanently lost interest in). Maybe this is because I started to read very early (I don't remember learning to read at all) and by the time I was 10 I had already read many adult books.
Or maybe I just never grew up.