A new study shows that Americans’ risk of developing dementia after turning 55 is more than double what earlier research had found. The New York University study estimates that the number of dementia cases will double by 2060, reaching 1 million new diagnoses each year. John Yang speaks with Dr. Josef Coresh, one of the authors of the study, for more. PBS News is supported by - https://www.pbs.org/newshour/about/funders