Age-friendly design embodies a pivotal urban development endeavor in addressing the aging society during China’s urban renewal era. Among the key components of this renewal process, community parks occupy a prominent position, and their adaptation to cater to the older population stands as a significant area of research and development. Drawing upon an analysis of the characteristics and requirements of the senior population, along with factors influencing their participatory construction of community parks, this study proposes methodologies for elderly-involved construction activities encompassing design, planting, maintenance, and activity participation. Capitalizing on a user-centric approach, the study targets three primary aspects—space, facilities, and activities—to proceed with an age-friendly renovation for the Xinmenkou Community Park in Gulou District, Nanjing, China. By introducing tailored zones such as a self-created space zone, a planting experience zone, a voluntary maintenance zone, and an activity participation zone, the design aims to fulfill the aspirations of older residents for the participatory construction of community parks. This innovative scheme revitalizes aging urban communities and presents a fresh perspective for urban renewal strategies.