Fewer adults are marrying, and for those who do, the average age at time of first marriage has been steadily rising http://mic.com/articles/92361/the-median-age-of-marriage-in-every-state-in-the-u-s-in-two-maps
This article says that college educated women benefit financially from marrying later, whereas men of all educational levels from marrying earlier. http://www.theatlantic.com/sexes/archive/2013/03/getting-married-later-is-great-for-college-educated-women/274040/