The 20th century was the century of explosive population growth, resulting in unprecedented impacts; in contrast, the 21st century is likely to see the end of world population growth and become the century of population aging. We are currently at the crossroads of these demographic regimes. This book presents fresh evidence about our demographic future and provides a new framework for understanding the underlying unity in this diversity. It is an invaluable resource for those concerned with the implications of population change in the 21st century. The End of World Population Growth in the 21st Century is the first volume in a new series on Population and Sustainable Development. The series provides fresh ways of thinking about population trends and impacts.

From two leading experts, a revolutionary new way to think about and measure aging. Aging is a complex phenomenon. We usually think of chronological age as a benchmark, but it is actually a backward way of defining lifespan. It tells us how long we've lived so far, but what about the rest of our lives? In this pathbreaking book, Warren C. Sanderson and Sergei Scherbov provide a new way to measure individual and population aging. Instead of counting how many years we've lived, we should think about the number of years we have left, our "prospective age." Two people who share the same chronological age probably have different prospective ages, because one will outlive the other. Combining their forward-thinking measure of our remaining years with other health metrics, Sanderson and Scherbov show how we can generate better demographic estimates, which inform better policies. Measuring prospective age helps make sense of observed patterns of survival, reorients understanding of health in old age, and clarifies the burden of old-age dependency. The metric also brings valuable data to debates over equitable intergenerational pensions. Sanderson and Scherbov's pioneering model has already been adopted by the United Nations. Prospective Longevity offers us all an opportunity to rethink aging, so that we can make the right choices for our societal and economic health.

The 20th century was the century of explosive population growth, resulting in unprecedented impacts; in contrast, the 21st century is likely to see the end of world population growth and become the century of population aging. We are currently at the crossroads of these demographic regimes. This book presents fresh evidence about our demographic future and provides a new framework for understanding the underlying unity in this diversity. It is an invaluable resource for those concerned with the implications of population change in the 21st century. The End of World Population Growth in the 21st Century is the first volume in a new series on Population and Sustainable Development. The series provides fresh ways of thinking about population trends and impacts.