The only questions are two:
does one live an enjoyable life while one lives; and
does one have the cognitive and physical fitness to care for oneself, still.
And in the end, that again is just one question. My goal is to live autonomous and more enjoyably than sad or angry, that is what that health trip of mine is about. I am not about extending life, but extending life quality and health.
That is also due to past serious and mysterious, never correctly diagnosed health issues I once had with my neural system that caused severe pain attacks and apparent neural degeneration for which they had no answer and idea. I usually do not talk about this. I never got a fitting diagnosis. I lived for many years with the expectancy that I would not reach statistical average life expectancy of white males, and they told me that at the time and day I now write this I maybe already would not even be here anymore.
Maybe I will die earlier than others, nobody knows what happens next. Point is I have none of this neurological problems anymore, and I do not think about it anymore. Maybe 100% happiness is more than just the absence of pain and misery, but the absence of these two in itself nevertheless is a big Go-go!
This is also part of the explanation for why my trust in doctors is so limited.