Average life expectancy in the US is ca 80, a few years above that in most of Europe, and highest in Japan, Macau, Hong Kong, at 84-85 years (this is across everyone - typically there's a 3-4 year spread between men and women, so e.g. Hong Kong is 83.2 for men and 87.9 for women)
I work in hospice and see a variety of conditions. Some people in their 60's with significant mobility issues that are chronically exhausted, but then there's the patients in their 90's who just recently started cutting back on social events and activities due to injury/illness.
Seeing these differences was why I started roller skating (again) at 49 and increased other activities to keep my ass moving and challenge my coordination and balance. I want to get everything I can out of this life.
You can't control how or even if you will arrive at old age but you can swing the odds dramatically in your favor by the choices you make when you are younger. Eat healthily, avoid hard drugs and tobacco, drink alcohol only in moderation and get plenty of excercise that consists of four categories: resistance (aerobic), VO2 max (anaerobic), strength and stability.
Healthy people with good genes that have relatives who are mentally fit up to thier last days.
And people who think that all the money being dumpped into longevity by billionaires will increase the amount of time people in general can maintain a decent quality of life.
And then me, who is curious about how the world changes over long periods of time and just wants to be there to see it. And maybe see a breakthrough that somehow keeps us alive even longer. Death is so final.
Soon it will be possible to cling to the broken shell of what you once were, a mere vessel for arthritis pain and bittersweet memories of a time when you used to be able to walk to the bathroom. Hooray!
The point isn't just extending a vegetative state but a livable state. If life expectancy expands to 85, then you live comfortably until 65 or so. That means you can more or less be physically active just fine.
Look up on Google images old grandpa bodybuilders. There are 70 year olds that are stronger than majority of young men.
If life expectancy shifts upwards to 120 presumably the age of comfort also expands to 100, or what have you. Then it's a slow deterioration until 120 where you're basically a zombie. Of course this age depends on genetic variables as well as your personal health decisions.
My great grandma died this year at 100 and she was only a zombie from like 95. Until that point she was walking by herself and giving speeches, hosting parties, etc. 96 she caught dengue fever and lived, but was weakened. Then she caught covid a year later and lived, but was further weakened.
The final nail in the coffin was her falling and breaking her hip in January of this year. She was dead about a month later.
I want to live as long as possible because I want to know what humans discover. What is the fundamental nature of reality? Will we find life in the cosmos? Will we explore other planets? What is the secret behind the brain and consciousness? What maths is left to be discovered? How will human society develop? Will we fall into authoritarian surveillance states or break free into a post-scarcity classless utopia?
So many curiosities sometimes I wish I was like a vampire, just floating around the world forever seeing what happens.