Silver Book Fact
Growth of 90+ population between 1980 and 2010
The 90-and-older population accounted for 2.8 percent of the older population in 1980 and in 2010, they represented 4.7 percent.
He W, Muenchrath N. 90+ in the United States: 2006-2008. Washington, DC: US Census Bureau; 2011. https://www.census.gov/library/publications/2011/acs/acs-17.html