Yeah, with all those preservatives, it's no wonder we live an extra 20 years sitting in our own excrement and drooling so the elder care industry can make money from caring from our decaying bodies.
Not that I really disagree with your point, but is that life expectancy past adulthood or total life expectancy? In the past, almost all of the improvement in life expectancy came from lowering infant and childhood mortality. Even in the bad old days, if you made it to adulthood, most made it into old age.