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Volunteer workers over age sixty-five were compared to retired elderly who did not engage in any type of work activity. Volunteers were found to have significantly higher degree of life satisfaction, stronger will to live, and fewer symptoms of depression, anxiety, and somatization. Since no differences were found on most demographic or background variables, participation in volunteer work appears to be the salient factor in explaining psychosocial differences between volunteers and non-volunteers.
Hunter et al. (1981) studied this question.