As Vietnam’s population aged at one of the fastest rates in Southeast Asia, this study examined the impact of the Thời Hoa Đỏ Club—a self-governed community singing initiative in Hanoi—on the quality of life and mental wellbeing of older adults. Employing a mixed-methods design, the research combined repeated surveys with 25 regular members, semi-structured interviews, and ethnographic observations. Quantitative findings indicated statistically significant improvements in self-reported life satisfaction, emotional wellbeing, performance confidence, and engagement with audio-technical devices (p < 0.001). Thematic analysis of qualitative data underscored the importance of intergenerational space, emotional expression, and social recognition as mediating factors. Anchored in theoretical frameworks of active aging, community music, and informal social care, the case of Thời Hoa Đỏ demonstrated how participatory arts could facilitate cost-effective and humane models of social support. The study contributed to a growing body of evidence that grassroots cultural initiatives, when flexibly organized, may serve as sustainable social-emotional care mechanisms in rapidly urbanizing contexts.