When I was a child, I read voraciously. I loved children's fiction (and still do), and I was very into the Baby-Sitters Club series, Beverly Cleary's books, and Johanna Hurwitz's books. But as I got older, I lost interest in "age-appropriate" fiction. I think why I love children's fiction so much is because it deals with school a lot and issues that are interesting to me. Adult fiction is usually about romance, crimes, etc., and all of this bores me greatly. When I go to book sales, I gravitate towards the children's fiction and the non-fiction.
The majority of what I read nowadays is non-fiction, mainly science, since that is one of my biggest special interests. I am a slow reader now (from my OCD- I was a fast reader as a kid), so I have stacks of science books that I've acquired throughout the years that I've yet to read. I just finished two books on venomous animals, this week I'm going to start a book about parasitic effects on animals' brains, and when that one is done, I'm probably going to read a toxicology textbook I got for Christmas a few years back. What I tend to do is read a lengthy textbook, read some non-fiction novels for a while as a break, and then start another lengthy textbook. My last textbook was a nephrology book that I finished a couple of months ago.