According to Wagers, if aging can be reversed, instead of the slow, steady decline into senescence we are used to, we might just live and live and keep on living, as healthy and apparently young-seeming humans, right until some organ or other fails catastrophically. This in stark contrast to the dystopian future imagined by, for example, Gregg Easterbrook last year in the article “What Happens When We All Live to 100?” in The Atlantic. Easterbrook and others posit a future in which life spans keep extending but “health spans” don’t, and the sickly elderly live for decades and suck all of the money out of the economy. In Wagers’s version, on the other hand, everybody stays healthy right until they die—so maybe there doesn’t need to be a retirement age, and the economy grows and grows. Though perhaps that’s a recipe for another kind of dystopia: one where we work and work and work and never stop working for 384 years, until the day we die.