Research suggests ________ greatly improves older people's health and feelings of well-being as they age.

A) exercise
B) support group
C) plastic surgery
D) family support

Exercise has been found to improve physical and mental health, reduce the risk of chronic diseases, and enhance feelings of well-being for older adults. Support groups, plastic surgery, and family support can also have positive impacts, but the research suggests exercise is the strongest predictor of health and well-being in later life.