Often we take our , 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 y. Being y 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, ....