This qualitative case study aimed to comprehensively understand the baby boomers’ continuing career development activities after their retirement. In particular, the study interpreted the continuing career development of the baby boomers as a lifelong learning phenomenon and examined their career development,focusing on the process of re-entry into the labor market. In this aspect, this study suggested the directions and implications of career development and vocational education and training as lifelong education. The findings of this study are as followed. First, the participants’ formal and informal learnings were integrated within the process of re-entry into the labor market. They applied and connected their expertise from the previous work experiences to the current new career, and then expanded their experiences through consecutive career development. Additionally, work was the tool of self-realization, going beyond the meaning of economic way, and it was reconstructed as the meaning of their daily lives, closely attached to their life.