Earlier quoted context omitted.
> Is this just for rich people or do poor people get to live for centuries too? "centuries" is far too short-term; "forever" is the goal, and "centuries" just buys enough time to get there. And of course that lifespan should be available to everyone. If the solution itself doesn't already imply a post-scarcity world, then it'll help that once you have a cure for aging, it's more economical to supply that to everyone…
> > Is this just for rich people or do poor people get to live for centuries too? > "centuries" is far too short-term; "forever" is the goal, and "centuries" just buys enough time to get there. And of course that lifespan should be available to everyone. If the solution itself doesn't already imply a post-scarcity world, then it'll help that once you have a cure for aging, it's more economical to supply that to every…
A slim chance is infinitely better than no chance at all. How many cultures had even the remotest chance of actually doing something about it?
And no, I'm not certain it'll happen in my lifetime. I'd say that I'd be sad and disappointed if that didn't happen, but really if that doesn't happen then I won't be anything at all. But I still consider it by far the most important problem that could possibly be solved, and worth putting incredible effort and resources towards. I also consider it worth advocating, to encourage others to push for the same goal, or at the very least discourage others from perpetuating arguments that shut down such efforts.
> Actually living forever would be a greater hell than anything I can imagine.
Then don't. But I'd suggest trying it first, or significantly expanding your imagination.
> After the first few hundred years, when you realise that it's never going to end, after you've read every book and done all you've wanted to do, what then?
With all the imagination you can bring to bear, and a universe full of possibilities, you can only think of a few hundred years worth of things to do before you'd not only get bored but get so bored you'd long for death?
To give even a minimal lower bound based on your own comment, books and stories are already being written today faster than they can be read. And that's only one of myriad possibilities. A few minutes imagination can easily produce far more interesting ones.
Do you currently get bored with life and want it to end? If not, then why do you expect that to change in only a few hundred years?