I am over sixty myself and I can see where it just would not make sense to spend hundreds of thousands of dollars to keep me alive and perhaps not with good quality of life. My daughter is raising two little children and of course the money should go to people her age.
There is no unlimited supply of health care resources so by definition the provision of such services must be rationed some how. The real question is how best to ration them. A purely free market, supply and demand system would allocate those resources to those who needed them most, unlike the distorted, government involved situation existing today.