I could also imagine this book being of use to younger readers as an introduction to science, although in this case I would have more reservations. I feel that it is mostly concerned with describing the current state of science, rather than imparting the sense of curiousity which is vital to the scientific viewpoint. For this purpose I would prefer books which go into more detail for each subject, with more illustrations. That said, I don't think that any single book would compete with this one, and it does have a list of further reading at the end.
The book was published 13 years ago but I didn't feel that this was too much of a problem - although this is a long time in the fast moving world of science the basics don't change that fast.