As you can tell by your own sample, above 50, the improvements are more like a rounding error than anything. Considering that most of these "improved" lives are

As you can tell by your own sample, above 50, the improvements are more like a rounding error than anything. Considering that most of these "improved" lives are actually suffering from various chronic diseases, I don't think there's any improvement. It doesn't really matter if one lived 80 or 82 years, the quality of life of those 80 years is what matters and given how much time is invested now in healthcare compared to zero to nothing in the past, that is really non-productive, no fun, i.e. wasted time, so, subtract that from the overall lifespan and there's no improvement at all and on the contrary!