Like so many other things, you shouldn't give Harry or anything else to a child until she or he is ready for it. My 8 year old nephew, for instance, has read all four HP books and is reading the fifth. Other children might not be ready for any of them until into their teens.

PDC, at least you care. Lots don't and librarians, like teachers, see it. But don't use your grandchild as a ruler against which to measure all children. They are individuals and mature, physically, intellectually, and psychologically, at different rates. Statistics are wonderful, but they only apply to a large population -- and one isn't a large population. I'm afraid that all too often we lose sight of the individuality of children.