>>12103424Personally, I think even people 40+ years old stand a decent chance at immortality.
It's not like there's ever a moment where people jump from being how they are now to immortal. Say that it was discovered how to keep the body maintaining itself properly even in old age, something that's a reasonable goal within a few decades due to rapid advances in understanding of mammal biology. That still wouldn't be immortality, it'd simply mean that your risk factor for succumbing to certain diseases as well as physical trauma and pathogens no longer increases as you age. Risks that build up over the course of your lifetime due to accumulating defects or toxins will still be at least almost as much of an issue as they were before, for example cancer.
But if someone who's 50 years old today stayed reasonably healthy up until 80, and at that point it was finally figured out how to keep the body maintaining itself like a 20 year old's, their chances of dying from a wide range of conditions drops enormously, increasing their expected lifespan by decades. Their condition and appearance would still be worse than a 20 year old's, and they could still get unlucky and simply die from cancer or falling down the stairs; but as long as that didn't happen they'd live to see more and more medical improvements, becoming less and less likely to die.
tl;dr for someone who's 50 today, their expected lifespan will probably increase fast enough to having a good chance of lasting until immortality.
