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.