Ages 5 and older http://www.census.gov/prod/2003pubs/c2kbr-29.pdf "Annual Estimates of the Resident Population for the United States, Regions, States, and Puerto Rico: April 1, 2000 to July 1, 2008". United States Census Bureau. Retrieved 2009-02-05.  Àdàkọ:Cite ngs "Elevations and Distances in the United States [of America]". U.S Geological Survey. 29 April 2005. Retrieved November 6 2006.  Unknown parameter |dateformat= ignored (help); Check date values in: |access-date= (help)