john: canadian public safety minister david mcguinty, thank you very much. nk you. ♪ john: a new study shows that americans risk of developing dementia at any time after turning 55 is more than double what earlier research found. the new york university study estimates that the number of dementia cases will double by 2060 -- reaching 1 million new diagnoses each year. dr. joseph coresh is the director of the optimal aging institute at nyu langone health system. he is also one of the authors of the study. how significant are the findings? dr. coresh: it is important for all of us. if you are thinking of your lifelong health, it makes you realize that you need to consider the risk that at some point you may hit dementia before death. john: what accounts for the higher risk? dr. coresh: so basically we did a study that was more diverse in more centers and spanned both white and black americans and we also spent an enormous amount of energy to make sure we captured all the cases. then the population has gotten older. as life expectancy has gotten older, the risk