I started reading rather early. My mom began buying me Dr. Seuss books before I started kindergarten and my older sister liked to play school with my cousins and me and taught us to read and do basic math before we started school. I read a lot of books as a kid but I think I really started remembering books and being influenced by them around age 10 or 11. Some of the more memorable reads since then appear here.
Nine Tomorrows by Isaac Asimov
Childhood's End by Arthur C. Clarke