I think we can do better than c, but it's a lower bound: it avoids your concerns and is still a large improvement over the status quo. I'm rather unconvinced t

I think we can do better than c, but it's a lower bound: it avoids your concerns and is still a large improvement over the status quo. I'm rather unconvinced that's an improvement over the status quo... you've just granted the government the power to euthanize people. And you just know that they're going to find a way to abuse that. They'll start by giving extensions to really valuable people we don't want to lose; great scientists, artists, writers. And then it'll be "gee, I guess politicians are pretty awesome as well, perhaps politicians should get another hundred years too..." Pretty soon it's effective-immortality for political favours. No thanks, I'll take my chances with old age. The best solution is: (d) Build starships and expand into space. But I worry that curing aging might come first.