What do you consider an ideal lifespan?

What do you consider an ideal lifespan?

I don't really think in terms of what lifespan is good, what lifespan is bad. Because I think that, that at this point is a function of what we're used to. I think that we've seen already in society that lifespan has been increasing, just a little bit, let's say over the last fifty years…that attitudes to what's an acceptable lifespan have shifted accordingly. So for example, a hundred years ago, it was considered perfectly fine to die at the age of 60. People thought, well he had a pretty good inning. Now we think that's not good enough at all. And I think that will continue to be true as we succeed in pushing back the boundaries. So for me, what matters most is not to actually extend life, but to eliminate the suffering associated with going downhill during aging. And that will have, as a side benefit, the fact that we'll live a lot longer. But really, I think about the suffering first.