The mortality curve has a slope. It is usual for people to die before they reach the end of the slope. I'm responding to the astonishment registered that people could reach such long lives at all. It is, in fact, "usual" for a small fraction to reach such long lives, though one can rarely predict if it will happen. (I entertain a small hope for myself, from my mother's lineage. By the time that my father and his father were my present age, they were dead.)