Bennett devoted a large part of Old Age to the face, holding that systematic self-massage and muscular exercise of the cheeks, chin, throat, and the muscles around the eyes would rebuild the tissue beneath the skin, fill out sunken features, and remove wrinkles and sagging. He offered his own face as the proof: in the book he contrasts his sunken cheeks at fifty with their full and rounded appearance at seventy-two, attributing the change to persistent practice of the exercises he describes. The claim is classified as testimonial, resting on the author’s own appearance rather than on any measured comparison, and is recorded as unreplicated: no controlled study established that facial exercise rebuilds muscle or reverses the visible signs of age.