My sister is 22 years old this year and there is NO sign of her wisdom teeth.

Basically what I'm saying is that I am sure they will come through when they are ready.

After 3.5 years with braces which required the removal of 8 of my adult teeth (and other out soon) plus all 4 wisdoms I don't think teeth should be made to do what other people say. When he/the teeth are ready, they will probably all pop through at once!

As an aside...my mother was telling me that when I was born, there were two babies beside me in special care BORN with teeth. One with 5, and one with a full mouth of them.