Singles nation: Why so many Americans are unmarried

There is little debate that American adults are far less likely to be married than they were two generations ago. In 1950, married couples represented 78 percent of households in the United States. In 2011, the US Census Bureau reported, that percentage had dropped to 48 percent. In 2014, the Bureau of Labor Statistics reported that 124.6 million Americans 16 years and older were single, or 50.2 percent of the population, compared with 37.4 percent of the population in 1976. 

http://www.csmonitor.com/USA/Society/2015/0614/Singles-nation-Why-so-many-Americans-are-unmarried