People are living longer and the United Nations asserts that the number of people aged 60 and beyond may virtually triple to 2 billion by 2050. Therefore, population ageing has become a global phenomenon, which engenders an explosive increase in health, social, environmental, and financial costs for societies. Nowadays, many older adults are choosing to age-in-place and will need support to enable them to live safely and independently at home. Smart-home technologies can have an extensive and profound impact on ageing-in-place by changing the conditions for the provision of health- and social care, communication and social interaction, and providing new opportunities for health sustainability for older adults. In this talk, I will focus on the social pillar of sustainability to improve the care and quality-of-life of older adults in smart-homes. As such, I will describe and discuss the outcomes of my Ph.D. work, Social Hue, an ambient activity-monitoring social connectedness system to promote health sustainability in smart-homes. Key takeaways from this talk will highlight the importance of a customer-/patient- centered approach to health sustainability and design recommendations to better enable health sustainability in smart homes.