The growing number of seniors worldwide is the source of many challenges for our society. The first one is epidemiological and relies on the constitution of a group of older adults considered frail because of specific medico-social attributes, combining an accumulation of advanced chronic diseases, reduced resilience, loss of independence, and changes in the social and family environment. The second challenge is economic and corresponds on one hand to the financial costs of medical and social care for frail older adults, and on the other hand to the growth of an economic sector – the “silver economy” – based on the development of new services and new technologies to compensate for the disabilities of frail older adults.