http://cbo.gov/publication/
"By 2050, one-fifth of the total U.S. population will be elderly (that is, 65 or older), up from 12 percent in 2000 and 8 percent in 1950. . . "
"On average, about one-third of people age 65 or older report functional limitations of one kind or another; among people age 85 or older, about two-thirds report functional limitations. . . "
