It's an interesting point. I forget the exact quote and source, but it's something like: living to a very old age requires great emotional strength, and is lone

It's an interesting point. I forget the exact quote and source, but it's something like: living to a very old age requires great emotional strength, and is lonely, because you will see all those you love die. Getting to know your grandchildren and embrace their changing world is probably a good defence in this regard. To the extent I agree with the parent commenter about it being "a nightmare", the danger lies in exacerbating inequality. As with all medicines, those with access to life-improving medicines will be first world, wealthier people. But of course that's no good argument against progress, just an unfortunate short-term side effect of it.