I had this on cassette when I was 10 and I loved it. Not only is the story unique and well concieved, it also teaches some very fundamental science concepts along the way! I'm now 19 years old studying biochemistry and I'm sure part of my initial interest in science was sparked by this book.
I still listen and enjoy it even now. I would certainly reccomend this for male or female and for ages 9 and beyond!