 But we must consider the possibility that there is no correct standard. Perhaps death is no more determinate than adulthood. Some people are clearly adults and some people are clearly not adults. But, as any college professor knows, many people are ambiguously adults—mature enough to count as adults in some ways but not in others. Socially and legally, we treat 16-year-olds as adults for purposes of driving, 18-year-olds as adults for purposes of voting and bearing the full weight of criminal law, 21-year-olds as adult enough to drink alcoholic beverages, and so on. Nor is this disaggregation of adulthood incoherent or even particularly awkward; rather, it seems to fit the facts about the gradual development of maturity, acquisition of experience, and accumulation of birthdays. Disaggregating death, one might argue, would be similarly faithful to facts about the frequently very gradual demise of human persons.