[1] Mather,Mark and Diana Lavery,“In U.S.Proportion Married at Lowest Recorded Levels,”Population Reference Bureau,2010 /Publications/Articles/2010/usmarriagedecline.aspx.

[2] According to Robert B.Bernstein at the Census Bureau,in 1979,the median age rose to 22.1.

[3] Mather and Lavery,“In U.S.,Proportion Married at Lowest Recorded Levels,”2010.

[4] Cohn,D’vera,Jeffery S.Passel,Wendy Wang and Gretchen Livingston,“Barely Half of U.S.Adults Are Married——A Record Low,”Pew Research Center,December 14,2011,/2011/12/14/barely-half-of-u-s-adults-are-married-a-record-low/.

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