US Census Bureau
U.s. Census Bureau: Age Data
This website has data available on age at the following levels: National, State, County, and other. Other statistical sections are "International Data," "Baby Boomer," "Older (55+) Population," and "Elderly (65+) Population."
US Census Bureau
U. S. Census Bureau: People of Arab Descent
This report, based on the 2005 Census, details the distribution of people of Arab descent based on gender, age, marital status, country of birth, English-speaking ability, educational attainment, employment status, poverty level/family...
Other
Baby Boomer Head Quarters: The Boomer Numbers
This page, part of the many pages offered by Boomer Headquarters, has many valuable statistics collected from the U.S. Department of Commerce, Bureau of the Census along with interesting explanations of the numbers.