Unsurprisingly, the annual number of marriages in the United States has slowly but steadily declined over the last 20 years, with the marriage rate in the United States, i.e. the number of marriages per 1,000 people, simultaneously declining from 1990 to 2012. On a positive note, the divorce rate in the U.S. declined during the same period; although it is not clear whether this is simply a side-effect of the shrinking number of unions. It also seems to gain traction again.
Marriage statistics show that the age at which Americans first get married has changed significantly over the past three decades. In 1970, almost half of American women were younger than 20 years at the time of their first wedding, compared to only 6.94 percent in 2009. The age of men at their first wedding has increased simultaneously, albeit to a slightly higher level. Nowadays, the median age, i.e. half of the respective group is younger, the other half is older, on the first wedding day is at around 29 years for men and at about 27 years for women.
Sexual intercourse rates are remarkably higher among married persons than among singles, by the way, although the figures do not indicate whether or not the spouses actually sleep with their significant other or with someone else who is married.