How old do you have to be to work as a voice actor?

I don't think age has much to do with it because an under-aged person who is not old enough to enter into a binding legal document will have their parents assume responsibility as the child's representative to fulfill any contractual obligations entered into on the child's behalf . For example , Aaron Dismuke who provided the voice for Alphonse Elric was born in 1992 ; see related link below for additional information .