Why do we age? The answer to this question is critical to our ability to prevent and treat highly age-related diseases such as cancer and heart disease that now cause the deaths of most people in the developed world. This short book provides an overview of biological aging theories including history, current status, major scientific controversies, and implications for the future of medicine. Major topics include: human mortality as a function of age, aging mechanisms and processes, the programmed vs. non-programmed aging controversy, empirical evidence on aging, and the feasibility of anti-aging and regenerative medicine. Evolution theory is essential to aging theories. Theorists have been struggling for 150 years to explain how aging, deterioration, and consequent death fit with Darwin’s survival of the fittest concept. This book explains how continuing genetics discoveries have produced changes in the way we think about evolution that in turn lead to new thinking about the nature of aging.

Why do we age? Is aging inevitable? Will advances in medical knowledge allow us to extend the human lifespan beyond its present limits? Because growing old has long been the one irreducible reality of human existence, these intriguing questions arise more often in the context of science fiction than science fact. But recent discoveries in the fields of cell biology and molecular genetics are seriously challenging the assumption that human lifespans are beyond our control. With such discoveries in mind, noted cell biologist William R. Clark clearly and skillfully describes how senescence begins at the level of individual cells and how cellular replication may be bound up with aging of the entire organism. He explores the evolutionary origin and function of aging, the cellular connections between aging and cancer, the parallels between cellular senescence and Alzheimer's disease, and the insights gained through studying human genetic disorders--such as Werner's syndrome--that mimic the symptoms of aging. Clark also explains how reduction in caloric intake may actually help increase lifespan, and how the destructive effects of oxidative elements in the body may be limited by the consumption of antioxidants found in fruits and vegetables. In a final chapter, Clark considers the social and economic aspects of living longer, the implications of gene therapy on senescence, and what we might learn about aging from experiments in cloning. This is a highly readable, provocative account of some of the most far-reaching and controversial questions we are likely to ask in the next century.

The authors undertake the difficult task of assembling an objective and holistic picture of human aging, including the physical aspects of aging, chronic disease and health promotion in the later years, for students and professionals.

The field of gerontology has often been criticized for being "data-rich but theory-poor." The editors of this book address this issue by stressing the importance of theory in gerontology. While the previous edition focused on multidisciplinary approaches to aging theory, this new edition provides cross-disciplinary, integrative explanations of aging theory: The contributors of this text have reached beyond traditional disciplinary boundaries to partner with researchers in adjacent fields in studying aging and age-related phenomena. This edition of the Handbook consists of 39 chapters written by 67 internationally recognized experts in the field of aging. It is organized in seven sections, reflecting the major theoretical developments in gerontology over the past 10 years. Special Features: Comprehensive coverage of aging theory, focusing on the biological, psychological, and social aspects of aging A section dedicated to discussing how aging theory informs public policy A concluding chapter summarizing the major themes of aging, and offering predictions about the future of theory development Required reading for graduate students and post doctoral fellows, this textbook represents the current status of theoretical development in the study of aging.

With the world's population getting increasingly older, there has never been a more pressing need for the study of old age and ageing. An Introduction to Gerontology provides a wide-ranging introduction to this important topic. By assuming no prior expert knowledge and avoiding jargon, this book will guide students through all the main subjects in gerontology, covering both traditional areas, such as biological and social ageing, and more contemporary areas, such as technology, the arts and sexuality. An Introduction to Gerontology is written by a team of international authors with multidisciplinary backgrounds who draw evidence from a variety of different perspectives and traditions.

"The book goes well beyond the information in undergraduate texts and provides stimulating and useful coverage of key topics in biopsychosocial aging. Psychology is not prepared for the future growth of our older adult population, and I suggest Psychology of Aging: A Biopsychosocial Perspective as required reading for students" --William E. Haley, PhD; Professor; School of Aging Studies; College of Behavioral and Community Sciences, Tampa, FL "This book distinguishes itself from previous publications on the topic with a thorough review of the history profession of geropsychology and its timely inclusion of chapters on brain imaging techniques and the aging brain, cultural differences in aging ethnic and sexual minorities, cognitive interventions, and more. This book is a must read for undergraduate and graduate students studying aging, and one I will definitely recommend to students new to the area."--Sherry A. Beaudreau, Ph.D., ABPP, VA Palo Alto Health Care System and Stanford University School of Medicine "Brian Yochim and Erin Woodhead have created an invaluable tool for learning about and teaching geropsychology...This book will serve as a seminal text in training psychologists, social workers, and many other disciplines in the psychology of aging." --Erin E. Emery-Tiburcio, Ph.D., ABPP, Rush University, Chicago, IL The only graduate text to encompass the full range of issues regarding the psychology of aging This is the first graduate-level text that offers a comprehensive, in-depth chronicle of issues surrounding the psychology of aging emphasizing psychology, with a foundation in the biology, and an expansion into the sociological aspects of aging. The text is divided into three sections: biological underpinnings of aging, psychological components of aging, and social aspects of aging. Among the multitude of topics addressed are biological theories of aging, neuroimaging methods in aging research, neuroplasticity, cognitive reserve and cognitive interventions, a detailed overview of neurocognitive disorders in aging such as Alzheimer's disease and Lewy body disease, relationships in aging, work vs. retirement, cultural issues in aging, and aging and the legal system, to name just a few critical topics. With an emphasis on promoting critical thinking, the text is enriched with discussion questions in each chapter along with suggestions for more in-depth readings. In addition it includes chapter PowerPoints and an Instructor’s Manual with sample syllabi for a 10-week course and a 15-week course. Written for graduate students in multiple gerontology-related disciplines, the text is also of value to individuals studying nursing, medicine, social work, biology, and occupational, physical, and speech therapies. Key Features: Addresses the biological underpinnings of aging, psychological components, and social aspects Written by a variety of experts on each area Emphasizes critical thinking throughout the text Presents discussion questions in each chapter Includes PowerPoints and an Instructor’s Manual with sample syllabi Tailored to graduate students from multiple disciplines embarking on clinical or research careers involving older adults.

A NEW YORK TIMES BESTSELLER “Brilliant and enthralling.”​ —The Wall Street Journal A paradigm-shifting book from an acclaimed Harvard Medical School scientist and one of Time’s most influential people. It’s a seemingly undeniable truth that aging is inevitable. But what if everything we’ve been taught to believe about aging is wrong? What if we could choose our lifespan? In this groundbreaking book, Dr. David Sinclair, leading world authority on genetics and longevity, reveals a bold new theory for why we age. As he writes: “Aging is a disease, and that disease is treatable.” This eye-opening and provocative work takes us to the frontlines of research that is pushing the boundaries on our perceived scientific limitations, revealing incredible breakthroughs—many from Dr. David Sinclair’s own lab at Harvard—that demonstrate how we can slow down, or even reverse, aging. The key is activating newly discovered vitality genes, the descendants of an ancient genetic survival circuit that is both the cause of aging and the key to reversing it. Recent experiments in genetic reprogramming suggest that in the near future we may not just be able to feel younger, but actually become younger. Through a page-turning narrative, Dr. Sinclair invites you into the process of scientific discovery and reveals the emerging technologies and simple lifestyle changes—such as intermittent fasting, cold exposure, exercising with the right intensity, and eating less meat—that have been shown to help us live younger and healthier for longer. At once a roadmap for taking charge of our own health destiny and a bold new vision for the future of humankind, Lifespan will forever change the way we think about why we age and what we can do about it.