Got this as a birthday gift for my daughter who loves space. The book is a little advanced for her (she turned six), however it is written in a way she can understand the majority of the information. While she is a gifted reader it's not something that she would read to herself for more than a few minutes because of the large amount and range of information. However it has proved a good book to read at bedtime and will prove to be worth reading for many years to come yet. Overall great book.