Accelerated population ageing, long a significant issue for developed countries, is now becoming important in the developing world too. Population ageing is one of the great achievements of the past century - although it brings its own social, economic, political and cultural challenges. The quality of life of older people is strongly conditioned by their capacity to manage opportunities and risks. Social protection, both formal and informal, can be critical. This book examines the links between well-being and development, drawing on examples from low, middle and high-income countries. It examines ageing in a number of very different development contexts - Argentina, Brazil, China, Ghana, Japan, Mexico, Thailand, Ukraine, UK and USA. It highlights the complexity of relationships between development and the way later life is experienced, identifies key priorities for policy-makers, and maps out an urgent research agenda.