Churches don't generally make official rules as to when to expel their "rebellious" children, JW's are the same in this regard, there is a citation of the Law of Moses that says 'rebellious' children should be stoned to death and then allow parents and others to make their own application, If they say anything specific such as "young folks should not be allowed their driver's license before they get baptized" this is done verbally only, not in writing, so folks (governing body in this case) cannot be held accountable,
My father started threatening home expulsion when I was 15, I was out at 16, (although I was baptized at 15 I was disrespectful)
:0)