"For what it's worth, rental car companies won't allow drivers under 25 because their insurance companies have a wealth of data to demonstrate that's when reliable levels of independent judgement emerge. For the same reason, militaries prefer soldiers who are under 25."

That's a very uncommon and great way to look at military recruitment. I've been focusing on the "not enough judgment for beer or voting but good enough for murder" angle but I think I might quote you too. ;)