Great for kids aged 7 to 77 -- or even older. I've been around long enough to be a parent, but short enough I still enjoy the book's abundance of clever word-play. .. I decided to check out the book again after noticing the animated-film version (1970) was done by Chuck Jones and Mel Blanc of Looney Tunes fame. On the AudioCD, you'll likely recognize David Hyde Pierce's voice as Niles Crane from "Frasier." .. And pleasant surprise: the last CD includes a wonderful interview with the author Norton Juster, describing the source of his humor and inspiration for writing this book.