This book was a wonderful read for myself (pushing 40) and my 10 year old, and could easily appeal to even younger readers and children who enjoy being read to. The language is very poetic and calming, and Ivan (the gorilla) shares many poignant thoughts that readers will absorb in different ways, depending on their maturity. There are strong feelings of loss at times, so that could be a concern for younger children-- but also great conversation-starters. I don't like politics and an author's personal ideology rammed down my throat...and I'm happy to say that although there is a slight introduction of "animal rights," it is an appropriate contribution to the overall story. There is also loose referencing to evolutionary beginnings. I've seen it suggested as a good read for animal lovers, but I would say it appealed mostly to my daughter because of the artists (a young girl and Ivan, himself.) It is a beautiful, beautiful story that I will remember.