Rillamas-Sun E, LaMonte MJ, Evenson KR, Thomson CA, Beresford SA, Coday MC, Manini TM, Li W, LaCroix AZ. The Influence of Physical Activity and Sedentary Behavior on Living to Age 85 Years Without Disease and Disability in Older Women. J Gerontol A Biol Sci Med Sci. 2018 10 08; 73(11):1525-1531.