I was wondering if the money was worth it because I usually get great prices for kid books....my review and advice is just go ahead and buy a few of them. Our kids have so many things but this isn't "toy or book" it's the beginning of an be important subject. It will help you as a parent teach body safety / body empowerment. I had purchased a few books to start with my 3 year old about a year ago. There's a page I really didn't fully read yet because she was just not ready ... But this book will grow with us as she ages. Consider this type of purchase and the other body safety books you buy more like a safety item, a necessity, to invest in safety!
Everyone is different but I would say it could be used with kids 3-7