While some may prioritize extending their life, I personally prioritize improving the quality of my life while I am alive.
A balanced diet, engaging in regular physical activity such as walking outdoors, and ensure getting sufficient sleep..
Don’t smoke, don’t drink.
Living healthy to increase my health span is still something I can control and chose to do.
Pointing to anecdotes of healthy people who were stricken anyway as a reason to live an unhealthy life will end predictably.
It is personal for me. My grandfather spent several years spoon feeding his mother who had severe dementia. He didn't resent her. He loved her but it still impacted him. When his own health later degraded to the point where he was going to need more care from the people he loved, he couldn't live with the thought of losing control and being a burden to his children so he ended his life. It was not a spur of the moment decision. He had all the legal and fiscal matters lined up. He even had his tombstone in place. He lived a full life with lots of close family and friends. Was he a coward or a saint? Maybe some of both. Maybe neither. Maybe he was just practical to the end. I haven't figured it out.