Objectives: The present study aimed to assess the correlation between the sense of belonging and expectation regarding aging in the elderly. Methods: This cross-sectional study was conducted on 300 elderly residents in Tehran and Ghazvin, Iran. The expectations regarding aging (ERA-12) was used to evaluate the same variable, and the other measurement tool was the sense of belonging instrument. Results: The sense of belonging had a direct, significant correlation with expectation regarding aging (β = 0.466; P < 0.001), so that the sense of belonging could predict various dimensions of expectation regarding aging, such as physical health (β = 0.20; B = 0.08; P < 0.001), mental health (β = 0.40; B = 0.31; P < 0.001), and cognitive function (β = 0.40; B = 0.34; P < 0.001). Conclusions: Considering the obtained results, it is recommended that special attention be paid to psychological factors (e.g., sense of belonging) in order to improve interpersonal relations and healthy aging in the elderly. Furthermore, these factors have a significant impact on the life expectancy and quality of life of this population.