In this document, "middle age" is defined as the 26- to 65-year age span during which there is a steady decline of both physical and mental capabilities and a change for the worse in personality traits. The document summarizes the findings of recent training experiments in adult health and physical education that indicate possible ways of postponing some aspects of physiological aging. Some topics discussed include the beneficial results from a) body locomotion and progressive endurance exercises; b) vitaminization (especially Vitamin C, which is not manufactured by the body); and c) physical training, which according to one study influences a common denominator that accelerates growth, decelerates aging, and prolongs life. (JA)