There was a time when living to 100 seemed impossible, but not any longer. Can the process of ageing be slowed or even reversed? Do those who have already lived to 100 hold the secrets that will help us all live longer? While science tries to find the answers to living a long and healthy life, societies with ageing populations, such as Japan, are finding new ways to help their older population live active and connected lives. On the Inquiry this week, Charmain Cozier asks, how do we live to 100? Presenter: Charmaine Cozier Produced by: Louise Clarke-Rowbotham and Ravi Naik Editor: Tara McDermott (Chocolate 100th Birthday Cake. Credit: Getty images)