People have always dreaded getting older.
Long before the tech entrepreneur Bryan Johnson tried infusing his son’s blood in an attempt to halt his own senescence or the entrepreneur Peter Diamandis started undergoing regular blood plasma exchange as part of an expensive healthcare regimen that he hopes will extend his own longevity, Louis XIII of France, Pope Innocent VIII and the French physician Charles-Édouard Brown-Séquard were busy trying to “rejuvenate” themselves.
