Britain’s performance in dealing with its ageing population will be compared against that of other major economies in new research to be carried out over the coming year. The International Longevity Centre UK will set up the Healthy Ageing and Prevention Index, which will track how countries across the G20 are introducing preventative medicine to head off health problems and tackling health inequalities as the proportion of over 50s grows. It will also be designed to show how they promote behaviour to keep people healthier for longer – such as frequent exercise – and to provide opportunities for sharing best practice. Research by the think tank shows that by 2050, 40% of the G20’a populaton will be over 50.