Writing in The Conversation, Dr Scott Chiesa (UCL Institute of Cardiovascular Science) argues that targeting dementia prevention at younger ages could reap great benefits. More than 60 million people are estimated to be living with dementia, resulting in over 1.5 million deaths a year and an annual cost to the global healthcare economy of around US $1.3 trillion (almost £1 trillion). Despite decades of scientific research and billions of pounds of investment, dementia still has no cure. But