Dorian6 said:
Immortality is a fate worse than death.
I agree with the basic principle, mostly, but the logic you use to get there is flawed. Mainly, you're still thinking in the short term (relatively speaking), when the big problem is the concept of Eternity.
If I live forever, the chances of me being somehow immobilized jump to 100%. What happens if I'm in an earthquake and get trapped under a building? I will literally be trapped until the planet explodes.
I'm sure that some archaeologist will dig you out soon enough. Just sit tight for a few thousand years. Whatever is imprisoning you is not eternal, you are.
Even if I'm absurdly lucky and don't get stuck somewhere, I'm not going to be able to tell anyone I'm immortal. Every government, criminal agency and billionaire will come after me under the assumption that somewhere in my physiology is the key to eternal life. And I would really like to not end up vivisected by some lunatic.
Well yeah, if you're dumb about it. But there are a lot of ways to avoid anyone noticing that you're eternal. Simplest way is to fake your own death, move somewhere else, and claim to be as young as you can get away with in your new identity. Big Brother makes it impossible to hide? Hack the system. You've got time to learn how. Also, money = power, time + intelligence = lots of money from long term investments. After a lifetime or two you should be powerful enough to stop or take over any group that tries to capture you for study. And in the event that you do get kidnapped and vivisected even with your safeguards, wait it out. Sure it'll be unpleasant, but whatever is holding you is not permanent. You are. If nothing else, after a few decades of failure the lab will get shut down, or the researchers will give up.
But let's say I avoid notice through a series of false identities, over thousands of years. No matter what stupid people would like you to believe, humans are still evolving. In a few millennia I would be to super evolved humans, as neanderthals are to us.
You might be physically inferior (though I doubt it, given that modern humans tend to breed for beauty or occasionally intelligence, rather than strength), they might have psychic powers, whatever. But you have millenia of experience, and thus will never be worse off intellectually, financially, or any of the other ways that really matter. And you can always fill any gaps in your capabilities with cybernetics (regeneration screwing with your new metal arm? spend a century or two figuring out how to avoid or bypass that problem).
Someday Humanity will become extinct. What happens then? I wander the earth alone for eternity? What happens when the world explodes? I just float around in the infinite vacuum of space forever?
What kind of life is that?
Humanity extinct, despite (or because of) your best efforts? Find a new species of sophonts to be your friends. No way to find or get to them? You have infinite time to invent and build the right tech. They don't exist? Make your own.
Any specific, quantifiable problem can be solved with sufficient application of time. The reason that you shouldn't want to live forever any more than you want to die right now is the big unknown: Eternity. A human mind is finite, and thus fundamentally incapable of comprehending something infinite. We can talk about where you'll be in a hundred years, a thousand, a million, a billion, but infinite time from now? That's a bigger and much more frightening unknown than death, and dooming yourself to it is at least as stupid. Death either leads to an infinite afterlife (in which case the choice didn't really matter), a cycle of some sort (in which case you get to try again), or nothingness (in which case at least you aren't suffering). But eternity we can't even guess at, and if you don't like it you'll be wishing for a death that you know cannot come, just for a change of pace if nothing else.
Forever.