My grandfather looked in his 50s and had more mobility than 50 year old men well into his 80s it’s only when cancer got to him that he started looking his age.
I've definitely experienced mental states that were worse than being dead. I don't regret remaining alive because of all the positive experiences I've had afterwards. But if we are talking about extending suffering that's only followed by death, I don't see the point.
I’m wondering if you’ve ever felt debilitating acute pain. I had nerve pain in the past to where my leg felt like it was on fire. It was then I understood how people get addicted to pain killers. I was able to address the problem and I’ve been fine for many years, but it hurt more than any pain I’ve ever had - and I have had many from sports.
But if you can get me 90 years where I feel like a spring chicken until 89, then that’s just fine.