Angela Rippon and Dr Chris Van Tulleken team up with scientists to demonstrate what can be done to reverse the ageing process. In the final episode, 45-year-old Tina Collett discovers the damage her diet is doing to her skin, and ex-policeman Rich Jones scores the worst body age seen on the programme so far. Elsewhere, 68-year-old Isabella McTaggart learns how to reverse her brain's decline. Last in the series.