You don't die of 'old age'. You die of disease(s), which become more and more likely as you accrue damage throughout your life. You can't really extend the period someone stays alive with end stage dementia or cancer. If anything, you can only prevent, halt, or slow the development of the diseases. And that's what's meant by longevity/extending life.

Granted, you'll still accumulate non fatal issues. But I'd argue you can lead a meaningful life with knee pain and far sightedness.

[–] echodot@feddit.uk 3 points 1 day ago (1 children)

But I'd argue you can lead a meaningful life with knee pain and far sightedness.

My back started hurting at 25, I hadn't even had a job yet.

[–] Droggelbecher@lemmy.world 1 points 1 day ago

That sucks! Mine started hurting at 27 (this year). My knees started hurting it around 16. I dont think I should want to die due to this.