TY - JOUR A1 - Payne, C.F. T1 - Aging in the Americas: Disability-free life expectancy among adults aged 65 and older in the United States, Costa Rica, Mexico, and Puerto Rico Y1 - 2015 DO - 10.1093/geronb/gbv076 JF - Journals of Gerontology Series B VL - gbv076 ER -