Although some people age faster than others, we cannot turn back time and curb our chronological age. As a research scientist, doctor, and physician-in-chief at Mount Sinai Hospital with four decades of experience, I know that what we can do is change our biological age--the measure of how well our body thrives and its potential for longevity. In The Science of a Long Life, I, Dr. Valentin Fuster, reveal the secret key to longevity. Using the latest research, I guide readers through all aspects of getting older--from our skin quality to our sex lives to our mental and physical health--and explore the art of living more and the science of living better. I also explain how to delay signs of aging inside and out through activities and exercises. Aging doesn't have to decrease our quality of life. With this book, we can live our twilight years to the fullest.