My sample size as an adult is still small, but I've seen this in pets and I've seen this in humans. The downward slope quickens faster than any would like once

My sample size as an adult is still small, but I've seen this in pets and I've seen this in humans. The downward slope quickens faster than any would like once it starts. The body or the mind slips away, leaving someone either trapped in a shell that doesn't work, or momentary fragments of the person who was among a sea of futile vapid existence. Our medical technology is not there and shows little sign of being close to resolving either issue. Rather than slowly wasting away I too would rather have the option to twist to the side off the cliff rather than the long slow painful stair tumble down the hill.