Recently, the theme of aging has been in vogue. Therefore, it is necessary to pay attention to the social role and change in perception of the elderly. This study tried to understand the elderly as active subjects of life beyond the boundaries of objectification of social problems from loss of role and social isolation. Therefore, I tried to understand the experience of living lab activities of the elderly, what kind of change process appears through the experience, and to find out the characteristics of the elderly's serious leisure experience. As a research method, case studies were used among various qualitative research methods. As a result of the study, the elderly appear as spectators in the early days of Living Lab activities and become disrupters due to their rejection of outsiders' visits to the park. However, as a consensus on the Living Lab issue is formed, it becomes a cooperative relationship, forming another relationship by working together to solve problems, and transforms into a subject that the elderly make themselves. In this process, it develops into a mediator and devotee who supports and supports colleagues, and shows new possibilities as a reproducer of play. The characteristics of the elderly's serious leisure experience were a sense of belonging through the ritual process of the community, companionship through letting go and devotion, and happiness through giving and sharing. In conclusion, the elderly's leisure activities are not seen as a time to achieve simple pleasure and satisfaction, but suggest the possibility of new changes in the individual's inner value and social role.