The average age of first marriage has been growing for quite some time. This uptrend was in part a reversion to historic averages. The very early age of marriage in the 1950s was unusual. The frequently told story that most people used to get married as teenagers prior to the modern era is not true. Even in colonial times, most people married in their 20s.
Still, we are now reaching unusually high levels. Here’s a recent chart from the Census Bureau:
The average age of first marriage is now over 30 for men and over 28 for women. Keep in mind that the number of people who will never marry is projected to increase as well. Some studies suggest as many as a quarter of Millennials will never marry.