Forever Young

Is ageing a disease? One that can be 'cured'? BBC Health Reporter, Gabriela Torres meets the self-experimenters and scientists who are trying to dramatically extend our lives.

Elizabeth Parrish, from Seattle, claims to have undergone the world's first gene therapy to reverse the biological age of her cells. Her methods caused controversy in the scientific community, but the idea that we may be able to slow or even stop the ageing process is gaining credibility.

In Silicon Valley the founders of Google are pumping hundreds of millions of dollars into a company that will carry out research into human life extension, employing world renowned scientists like Cynthia Kenyon to work on the problem. We hear from mavericks and mainstream scientists - many of whom believe a world in which we can stay youthful for several centuries could one day become a reality.