I watched my mom go through a year of hell before passing away of congestive heart failure at 90, my father more like two years of confusion until 99 and 11 months, three weeks. He was a minor league player as a young man, and in his last few months he thought the Yankees were going to give him a call. Currently observing my in-laws dealing with losing touch with reality, adult diapers, help going to the bathroom, not knowing their own kids, fearing death, and angry about being treated like children.
The USA has an industry that's really good at keeping us alive, as long as the money keep following. Quality of life, otoh, isn't part of their business plan.
I am not worried about a heart attack.