Everyone likes a slice of wedding cake, but our opportunities to munch on the delicious dessert might be shrinking. According to an article in the Dallas Morning News, new research shows millennials aren’t getting married. Even though millennials are a large generation (by some accounts, bigger than the Baby Boom cohort) and are at prime marriage ages, rates of marriage are dropping across the U.S. Some projections suggest it could drop to 6.7 in 1,000 in 2016—a historic low. Why are heterosexual millennials delaying or forgoing marriage?

University of Maryland sociologist Philip Cohen’s research shows that the proportion of people getting married for the first time at older ages has risen in America, as economic and educational pressures encourage people to wait to wed. In addition, the U.S. has become less religious and more comfortable with unwed parents and cohabitation. W. Bradford Wilcox, a University of Virginia sociologist, adds, however, that there are some upticks in marriage trends, such as a rise in the proportion of educated persons who wed and an influx of Hispanic immigrants that could have positive impacts on American marriage rates, if not in the immediate future.