Baby Boomers cause a rapid increase in the elderly population, but they are different from the existing elderly generation. Therefore, there is a need for a study on the preparation of the elderly generation and successful aging targeting Baby Boomers. The purpose of this study is to empirically test the mediating effect of Participation in Lifelong Learning between the Social Capital and Successful Aging of the first Baby Boomers. In order to achieve there search purpose, the written and online surveys were conducted for the first Baby Boomers born between 1955 and 1963. According to the procedure suggested by Baron & Kenny(1986), multiple regression analysis was applied. In addition, bootstrapping was performed to verify the statistical significance. The results of this study obtained through such processes are as follows; First, the Social Capital of the first Baby Boomers had a positive effect on Successful Aging. Second, Participation in Lifelong Learning was found to partially mediate the relationship between Social Capital and Successful Aging of the first Baby Boomers. Based on the above analysis results, the conclusions and implications were suggested.