Verified answer

Average..

There is no set size for any age, so what you have is what you get, you can not change it. It is the only one you will ever have, so be very proud of it, look after it, put it in the right paces and enjoy

I do not know of that age but of an adult it is 4-6 inches. There was a recent study done to see what the average size was.

Please go to this question! http://answers.yahoo.com/question/index?qid=201312...