ller and more frequent meals and devoting more time to mild forms of exercise. For some of the members of this age cohort, biological changes related to energy depletion, illness, disease, or chronic debilitating conditions related to injuries may necessitate significant limitations on daily activities.
Baron, Byrne, and Johnson (1998) have noted that these kinds of biological changes often bring about depression among aging individuals and can have attendant or comorbid psychological effects. Facing the reality of a diminished capacity for activity and increased vulnerability to certain kinds of chronic or acute illnesses (e.g., heart disease, stroke, and cancer) is itself a source of psyc
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