Unpopular proposal: the animal world does it better. Older animals never slowly degenerate into nightmarish parodies of their former selves. When they slow down too much, they are killed and rejoin the circle of life.
When I think about slowly deteriorating into a dementia-ridden, wheelchair-bound elder living in a nursing home I am struck with horror. Old people are an enormously expensive burden to society and mostly live in misery and pain waiting for their next doctor’s appointment and their next friends funeral.
I wish there was a societal mechanism for an easy and clean death.