My mom's ex brother in law, in his middle 90's, had a blood clot in the artery supplying blood to his intestines. It started out with some minor cramps, and his doctor asked him what he wanted to do "If it's something bad". He said, without thinking (Thinking was never this guy's thing) "Everything you can!" He had no power of attorney, no living will, even though his kids had tried and tried to get him to set them up.
The night after he went to see his doctor, he started having terrible pain, and was taken to the hospital, where he was opened up, and gangrene of his intestines was found. He had the dead stuff removed, and was given a colostomy. He got a terrible infection, and then went septic, and nearly died. Because of his comment to the doctor, they opened him up again, and again, and again. His kids have tried to get the docs to stop, without success.
He's on a respirator, is not responsive, and shows signs of major brain damage. The doctors wanted to operate again,but he's in too bad of shape to allow it. HE MIGHT NOT SURVIVE, as if that's something bad at this point. He hangs on and on, over too months now, and the doctors call his son and daughter, who is very ill herself, and say, "This is it!", but it isn't. The doctors won't allow the respirator to be removed. His daughter came down here from 400 miles away the first 3 "this is it's", but she's waiting for a lung transplant, and just can't do it anymore. Meanwhile, the hospital bill is cranking up at warp speed, and is already over $280,000 and the billing at that hospital is very slow, so it's actually much higher. It's probably going to take the sale of his house just to pay the part of the bill his crappy insurance won't cover, probably $100K by the time it's over. What would have been a nice estate to leave to his kids and grandkids will be hammered by the time it's over. It's 2 months since this insanity started, and he hangs on and on. He's not going to be more than a vegetable if he were to somehow survive. He's said in front of many people that he never would want to live that way.
The point is, make a living will, and a power of attorney! NOW.