This book offers multidisciplinary perspective on the dynamic process of aging proposing strategies for developing more functional ageing societies. Gathering revised and expanded papers presented at the 3rd Congress of the Interdisciplinary Research Unit “On Building Functional Ageing Communities” , organized by the Polytechnic Institute of Castelo Branco, this book addresses the multidimensional aspects of sustainability in aging, exploring the environmental, health, social, economic, political, and cultural dimensions. Each chapter presents new perspectives that should help to understand the phenomenon of population aging in the context of sustainability and contribute to the promotion of Active and Healthy Aging that is also Sustainable. This book is aimed at a wide range of professionals concerned with aging and sustainability and the and the development of more sustainable and functional societies.