This study explored the relationship of physical mobility; social integration with children, siblings, other relatives, and close friends; and social satisfaction with friend and family relations to the well-being of unmarried Canadians age 75 and older. This study also explored the relationship between each of four social integration measures and physical mobility in potentiating well-being. To take into account any possible effects of demographics the following were included in a multiple regression analysis with the major study variables; age, gender, marital status and living arrangements. A correlational cross-sectional design, using a subsample of 754 unmarried persons living in the community was selected from an archived data set, Statistics Canada's 1985 General Social Survey. No significant interactions were identified between social integration and physical mobility. The results lend support to the importance of physical mobility and the quality of relationships to the older person's well-being. Physical mobility, satisfaction with friendships, being older, and satisfaction with family relations were identified as constituting the best set of variables most strongly related to well-being. Together they accounted for 40% of the variance (p $<$.01). Physical mobility was more strongly related to the well-being of men age 75 to 79 than that of any other gender-age group. Practice and research implications are discussed.