Data Dictionary: ACS 2005 -- 2009 (5-Year Estimates)
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Data Source: U.S. Census Bureau
Table: B12007A. Median Age At First Marriage (White Alone) [2]
Universe: White alone 15 to 54 years
Table Details
B12007A. Median Age At First Marriage (White Alone)
Universe: White alone 15 to 54 years
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2005-2009 Summary File: Technical Documentation.
 
Median Age
The median age is the age that divides the population into two equal-size groups. Half of the population is older than the median age and half is younger. Median age is based on a standard distribution of the population by single years of age and is shown to the nearest tenth of a year. (See the sections on "Standard Distributions" and "Medians" under "Derived Measures".)

Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2005-2009 Summary File: Technical Documentation.
 
White
A person having origins in any of the original peoples of Europe, the Middle East, or North Africa. It includes people who indicate their race as "White" or report entries such as Irish, German, Italian, Lebanese, Near Easterner, Arab, or Polish.