In the last five years, game-changing breakthroughs have redefined the way we think about ageing. More than ever, there is hope that we can overcome our greatest enemy - the process of biological decline. How to Stay Young investigates the latest research that could put the brakes on the ageing process. In Japan, discover the foods that add years to your life; in the USA, meet the Alzheimer's sufferers being injected with young people's blood; and in Ecuador, meet the boy with Laron syndrome who could hold the key to curing ageing - he will never grow old like the rest of us. A global quest to uncover the secrets of how we grow, develop and renew, this remarkable journey of human biology challenges everything we believe about getting old.