In 1960, 72% of all adults ages 18 and older were married; today just 51% are. If current trends continue, the share of adults who are currently married will drop to below half within a few years. Other adult living arrangements—including cohabitation, single-person households and single parenthood—have all grown more prevalent in recent decades.

The Pew Research analysis also finds that the number of new marriages in the U.S. declined by 5% between 2009 and 2010, a sharp one-year drop that may or may not be related to the sour economy.

The United States is by no means the only nation where marriage has been losing “market share” for the past half century. The same trend has taken hold in most other advanced post-industrial societies, and these long-term declines appear to be largely unrelated to the business cycle. The declines have persisted through good economic times and bad…

It is beyond the scope of this analysis to explain why marriage has declined, except to note that it has declined far less for adults with college educations than among the less educated. Some of the increase in the median age at first marriage over the long term can be explained by the rising share of young adults enrolled in college, who have tended to marry later in life; recently, there are indications that adults who are not college graduates also are marrying later.2 Fallout from the Great Recession may be a factor in the recent decrease in newlyweds, although the linkage between marriage rates and economic hard times is not entirely clear.3