To this conclusion I have come: The most deadly years of our lives are the ages 16 to 21. Those years give us a headiness that comes from new freedom — a driver’s license — and the passing of the torch from strict childhood rules to more trust, different restraints and relaxed curfews. When you add the opportunity to go off to college or move out on your own, we’re fooled into thinking we’re mature enough and wise enough to make decisions that will affect the rest of our lives.