And I think that's a fair point, actually. Death is a responsibility. Ascribing it solely to medicine is unfair, but it is our responsibility.
Could we extend the average lifespan of adults by 10 years by spending money? Easily. Most people live thoroughly unhealthy lives, many of them because they simply don't know better. Consider the whole "obesity epidemic". A large number of people will die comparatively young because of a complete failure of our society to teach them how to eat decent food.
Beyond simply curing gross mistakes in self-care, what about positives? Could we find ways to get the average healthy person to treat their body even better, and squeeze out some more life expectancy? I'm sure we could. More thorough study of the effects of nutrients and toxins, more efforts to reduce the amount of crap in people's food and other items that they come into daily contact with, etc, those would probably net another few years of improvement.
And that's only looking at western society. If you look at poorer countries, there are countless avoidable deaths there. Some organisations, like the Gates foundation, are trying to address some of the more obvious killers, like Malaria, which have been neglected for decades (if we'd really wanted to get rid of Malaria in the 50s, we would have done so).
Overall, I think it's fair to state that we could raise the life expectancy of almost every human on this earth by 10 years if we really tried. But we choose not to. There are 7 billion humans on this planet, and every day, we, as a society, make a choice, to not bother to create 70 billion man-years of life-expectancy.
It is a choice, or rather a lack of choice, and so yes, it is a responsibility. We all (me included) choose to give up on 70 billion years of human life, every day.