I get the concept. 16 and under are dumbasses who think they're invincible if we're being real. I wouldn't be surprised if the next internet challenge is to see how many red bulls you can drink in 10 minutes resulting in multiple deaths.
At the same time though, if you're going to ban this, then go all the way and ban anything that may give 16 year olds any kind of energy including soda and coffee.