Correct me if I'm wrong, but shouldn't the criterion be that the probability of death is the same between 80-90, 90-100, and so on (for example) to say that humans stop aging after 80?
Saying that your chance of dying is 50% after 80 != saying it's the same consistently after 80?
Saying that your chance of dying is 50% after 80 != saying it's the same consistently after 80?