Authorities are testing the skull for DNA. Preliminary estimation of the age of the child is 4 to 5 years of age. The condition of the skull suggests that it may have been in the water for some time.
A skull found on a Sydney beach might be from a museum or a private collection - Sept. 16, 2008
Unlocking secrets of the skull found on Mona Vale beach -September 16, 2008
The Daily Telegraph