Drawing on over 40 years of work prolonging the working lives for elite athletes and ageing bodies, professor of sports medicine Bill Ribbans distils a lifetime's knowledge of how our bodies work, how they age and what we can do about it. He shows that while we cannot deny time, we can extend our healthy life expectancy to the end of our lives. He looks at the risks to each body system - our heart and lungs, joints and bones, immune system - and shows how we can both minimise the chance of disease and extend the healthy function of each body part.