In the first episode, The Body, Angela and Chris discover that scientists now know how much of the way we age is down to genetics - and how much of it is down to the way we live our lives. They look at the latest science that reveals the best lifestyle choices we can make to combat the effects of ageing.

In episode two, The Brain, they explore the latest research into ways of keeping the brain healthier for longer. They also look at the science that could help protect against brain disease, one of the fastest growing areas of research, and a subject particularly close to Angela’s heart as her mother suffered from vascular dementia. In Japan Angela discovers the foods can help protect your brain and meets a 100 year-old who is living proof of the importance of diet in maintaining a healthy brain. In the USA Chris is granted exclusive access to a trial where Alzheimer's sufferers are injected with young people’s blood in order to observe its effects on the brain. The BBC team up with Kings College, London, to carry out a unique study into which exercise is best for the brain, putting brisk walking and table tennis head-to-head. The study reveals that after just 10 weeks of exercise actual changes to the structure of the brain can be seen - but which exercise comes out tops in improving brain function? How To Stay Young features inspirational centenarians, cautionary tales and offers tricks and tips to improve the cards we’re dealt - all with one ultimate goal: to help us live better and healthier lives for longer.