Mariana Cooper, 86,with her granddaughter, Amy Lecoq, 39. Ms. Cooper was bilked out of much of her savings by someone she considered a friend. Credit Ruth Fremson/The New York Times
With 10,000 people turning 65 every day for the next decade, a growing pool of retirees are susceptible to such exploitation. As many as one in 20 older adults said they were financially mistreated in the recent past, according to a study financed by the Justice Department.