For all its successes, mainstream medicine has failed to make much progress against the diseases of ageing that kill most people: heart disease, cancer, Alzheimer’s disease, and type 2 diabetes. Too often, it intervenes with treatments too late, prolonging lifespan at the expense of quality of life. Dr Peter Attia, the world’s top longevity expert who is featured on Chris Hemsworth’s National Geographic documentary LIMITLESS, believes we must replace this outdated framework with a personalised, proactive strategy for longevity.