This article offers a first analysis of the temporality of anti-aging, which, astonishingly enough, has been missing almost completely from anti-aging and life-prolongation discussions heretofore. While anti-aging experiments have existed throughout history, culminating in the 19th and 20th century, and are still booming today in most industrialized countries, the underlying temporal structures of this man-made tempering with human life experience and life cycle has not yet been the object of any comprehensive investigation. In the beginning, the article in hand will explain the essential differences between archaic and modern scientific conceptualizations and representations of anti-aging techniques and introduce the category of "progenesis" for the premodern approach. This will be followed by a short overview over the history of anti-aging and life-prolongation experiments in the 19th and 20th centuries. The article then discusses parameters, such as "longevity", "eternity", "rejuvenation", "anti-aging", in order to clarify experimental frameworks in life extension as a basis for the following analysis of the temporality involved. Finally, the paper introduces various concepts of time closely related to experiments on life prolongation such as grafting, blood transfusion and parabiotic techniques ranging from the 19th century up to our times: While the term "heterochrony" can be traced back to the 19th century, its meaning is gaining additional dimensions in the article in hand, and the concepts of "uchronia" and "pseudo-autochrony" are especially developed here for the first time in order to clarify the temporality of anti-aging processes and their biopolitical and philosophical dimensions.