The answer is everyone over the age of eighteen. Why? Because at any time in our lives we may become incapacitated, or out of contact and if medical or financial decisions need to be made, then someone you trust should be given the power to make those decisions for you. Military personnel and others who may be assigned to out of the way places always have those two legal documents in place, just in case they are needed. Any of us could be driving down the street and get hit by an inattentive driver. If the ambulance takes you to a hospital unconscious, and you need care decisions made, who do you trust to make those medical decisions. And if for a short time period, or a long time, you are incapable of making those decisions, you want the person you trust to make good decisions in keeping with your wishes. That person must have the emotional strength to make regular decisions or end of life decisions, which in many cases are difficult because emotions are deeply intertwined, even if it is clear that there is no hope.