I loved this book so much that I gave my hard copy to my brothers and sisters who are still quite young. My father read it to them and they all enjoyed it.
It depends on the child though, if your child has a very short attention span or you don't like having to get the dictionary out for some of the archaic language, then this book may not be a good idea. For the rest of the kids, it is a good read that allows them to think of not only what it would be to live a life of isolation, but a life of void of technology and what would have been expected of children in that situation.
I loved this book so much that I am going to read it again :D