Well-being in later life remains a contested and complex challenge for neurodiverse older adults (NDOA), whose experiences are often rendered invisible in public policy and systems of health and social care. Despite mounting evidence regarding intersectional disadvantage, aging with neurodiversity remains under-explored in both research and practice. This study draws on research conducted in Quebec (Canada) to examine how NDOA experience social exclusion and what is needed to support their meaningful inclusion, agency, rights, and well-being. The findings highlight persistent structural and relational barriers, including stigma, mistreatment, and system fragmentation. At the same time, participants reveal strengths, strategies of resistance, and reciprocity enacted across the lifecourse. This paper challenges the dominant discourse of well-being as a functional, individual state-of-being prominent within policy and practice and instead positions well-being as a structured and negotiated resource tied to power relations and institutional forces. In so doing, we open up avenues for the development of new models of well-being promotion in Quebec and beyond that are premised on coordinated policy action and the development of meaningfully inclusive, tailored interventions that confront social exclusion and foreground advocacy, voice, and solidarity. The paper concludes with concrete implications for policy reform, service design, and frontline practice aimed at ensuring neurodiverse individuals can age with dignity, support, and connection.