The importance of social sustainability, one of the three pillars of sustainable development, is increasingly recognised. Its implementation in the aged care system enhances stakeholders' quality of life and supports sustainable societal development. However, there is limited global research on social sustainability in aged care. This study aims to assess the overall social sustainability of the Australian aged care system and propose measures for its improvement. A conceptual framework was developed and applied to analyse the Final Report: Care, Dignity and Respect by the Australian Royal Commission into Aged Care Quality and Safety. The findings reveal that Australia's aged care system demonstrates significant deficiencies in social sustainability, with unequal access to care, services and facilities, and inadequate health and comfort for the elderly and their families. Employees contend with issues of unfair employment, insufficient compensation, unhealthy work environments, and inadequate education and training. Several measures are proposed to enhance social sustainability. This study provides a comprehensive analysis of social sustainability in the aged care system within a Western context. It enhances our understanding of the components of social sustainability in aged care, assesses its current status, identifies existing challenges, and provides possible directions for improvement. The insights from Australia's experience and potential solutions could inspire other countries to recognise the importance of social sustainability and reform their aged care systems towards sustainable development.