Part 1 of Essay
Why should the human body give out after 70, 80, or even 120 years? Why are older people more susceptible to disease, more inclined to have impaired vision and hearing, and likely to lose some of the physical and mental capacity they once enjoyed? There are no fully satisfactory answers to these questions. Although we are ....

Part 2 of Essay
.... disease, strokes, and cancer. Other diseases, accidents, and violence account for the rest--but not age. These same diseases and Alzheimer's disease account for much of the disability attributed to aging. As these diseases are conquered, far more people will live to their full potential life span and remain active and healthy for life. A lot is known about the diseases that affect people and cause death. Much less is known about real aging because it involves fundamental cell processes that are quite comple ....