Scientists know that there are two basic approaches to prolonging for life. One approach is the【79】of the disease that generally【80】older people-disease such as cancer, heart attack and strokes.【81】is the delay of the process of growing old--the【82】of the body. In recent years scientific researchers【83】much time in the study of the process of aging. They believe that, within a few years, they will develop the knowledge and the【84】to delay the aging process for 10 to 15 years. The result will be that more people will live longer, more healthy lives.【85】, scientists believe that with the fight diet, exercise, medical【86】, and mental attitude many people can【87】100 years old. Gerontologists, people who【88】studies of the growing old, are investigating why body cells show and【89】die. They feel that delaying this slowing down process would help postpone death. In a number of American universities, scientists are【90】the activity of cells, the effects of diet and internal body temperature【91】aging. If their studies are successful, the results should help【92】the quality of life for older people in the next few years,【93】increase the life span of the next generation. (46)