Health Often we take our health, or the absence of illness, disease, or injury for granted until we become sick. It is then that we recognize the worth of being without ailments. It is then that we appreciate feeling strong, robust and healthy. Being healthy and, being physically and mentally sound, is associated with one's satisfaction with life. Developmental health psychologists - specialists who study the interaction of age, behavior, and health and gerontologists - specialists in the science of aging -- are piecing together the details of diet, exercise, personality and behavior that make it practical to shoot for 80, or even 120. People approaching middle age