PLEASE HELP!!
In the kind of awesomely cool insaneness that only ever happens on something like Doctor Who, the collective children of planet Earth are pleading a very special case in front of the Universal Court of Intergalactic Justice: adults would be magically prevented from using the phrase "...because I said so..." if you, as the lawyer representing the children, win the case.
Using examples from the Age of Enlightenment, do your best to convince the Universal Court of Intergalactic Justice that power and obedience should come from reasoning and logic rather than from age and authority.