Yeah, I mean you only have to be 16 if you are male and 15 if you are female.
I have heard a talk by a NO priest who said his goal was to annulment proof his weddings and prepared the couples with that goal in mind.
Right, and making them both sign a docuмent (with a notary) goes a long way to that. It should be worded in such a way that there's zero wiggle room. Then, later, they can claim all they want that they didn't "mean" it, but so long as they knew what the words meant and signed it, then they MEANT it, regardless of some internal forum trickery.