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. From the nuns who lived into their nineties, to the septuagenarians taking up sport for the first time, via the revealing, if unlikely friendship of Jojo the monkey and Alan the cat, and the existence of 'Blue Zones' (areas of the world where inhabitants live longer), Professor Kenny's work lifts the lid on the importance of family, friends, laughter and good sleep and emphasises that we all are just as young as we feel.