Control is number one, and also makes up the high numbers for the membership-numbers-driven WTBTS.
Nobody outside the legal adult age should go into any contract, let alone the biggest contract which will affect the rest of a person's life.
What does this so considered Christian org have against following Christ's example in this regard?
The Bible clearly states that one should carefully follow Jesus' example in all things.
Well, as in all other cases, they cherry pick scriptures in this as well.