"Lifespan: Why We Age―and Why We Don't Have To" by David A. Sinclair is a book that explores the science behind aging and offers insights into how we can potentially slow down or even reverse the aging process. The author, a renowned scientist and expert in the field of aging, delves into the latest research and discoveries in the field, discussing topics such as the role of genetics, lifestyle factors, and cutting-edge interventions that can potentially extend our lifespan. This book provides readers with a deeper understanding of the aging process and offers practical advice on how to live longer, healthier lives.