We all age. But why do some of us live longer than others? Why do we live twice as long today as our ancestors did 200 years ago? And what does the latest science teach us that will help us not only live longer lives, but also to live fitter, healthier and happier lives, deep into our later years?Professor Rose Anne Kenny has 35 years of experience right at the top of ageing medicine and is at the forefront of scientific research into the subject. Age Proof takes Professor Kenny's ground-breaking research and reveals why and how some people have a lower biological age (how our body looks and feels) than chronological age (the number), and the role played by food, genetics, sex, physical exercise, cold water, childhood experiences, expectations, friendships, inequality and much more.