I dont believe that. It all depends on how you die, not how long you live. My grandfather died at home at 96 years of age, no nurse, no equipment. Just my grandmom and him, at home. I'd bet his medical cost of passing away is far lower than a type-2 diabetic in their mid-60s hospitalized for 5 years before passing, or a lung cancer patient (vis a vis Gladwell's example) going through chemo for 5 years before expiring. His analysis needs much more rigor, imo.
It may be cruel to say so, but it is logical that longer lifespans are costly.