Unfortunately it was not up to us about the age restriction. There are laws governing the types of prizes that we have to reward and the legal age that someone can be to receive them.
I'm sorry that you will be unable to participate in this round of WPASADI and I understand your frustrations. We are trying to come up with a solution for people that are not eligible to play (Non-US residents and underage) where you don't necessarily win a tangible prize, but you win something virtually that should be pretty cool.
We will keep you updated once we find out if we can do what we plan.