This study aims to verify the effects of interpersonal relationships and social support factors on the life satisfaction of elderly people over 65 years old divided into three age groups while using Carstensen & Charles' Social Emotional Selection Theory as a foundation. Data from the 8th year supplementary survey of the National Retirement Security Panel (KReIS) were used, and the data of 1,117 elderly people aged 65 years of age or older who were living alone were extracted and analyzed. First, there were differences in educational background, number of children, economic activity, and average monthly income among the examined age groups. Interpersonal relationships, social support factors, and life satisfaction were also all found to differ between the three age groups. Second, it was confirmed that higher social support factors were associated with higher life satisfaction in all age groups. This study is meaningful in that it analyzed the effects of interpersonal relationships and social support factors on life satisfaction according to the characteristics of each age group of elderly people living alone, and based on these results, this study suggested practical intervention measures for social welfare as well as follow-up studies that should be conducted to improve life satisfaction among elderly people living alone
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