Americans under the age of 45 have found a novel way to rebel against their elders: They're staying married.

New data show younger couples are approaching relationships very differently from baby boomers, who married young, divorced, remarried and so on. Generation X and especially millennials are being pickier about who they marry, tying the knot at older ages when education, careers and finances are on track. The result is a U.S. divorce rate that dropped 18 percent from 2008 to 2016, according to an analysis by University of Maryland sociology professor Philip Cohen.

Demographers already knew the divorce rate was falling, even if the average American didn't. Their question, however, was why? And what do current trends mean for the marital prospects of today's newlyweds?

One theory is that divorce rates are falling largely because of other demographic changes—especially an aging population. Older people are less likely to get divorced, so maybe mellowing boomers were enough to explain the trend. Cohen's analysis of U.S. Census Bureau survey data, however, suggests something more fundamental is at work. Even when he controls for factors such as age, the divorce rate over the same period still dropped 8 percent.

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“The change among young people is particularly striking,” Susan Brown, a sociology professor at Bowling Green State University, said of Cohen's results. “The characteristics of young married couples today signal a sustained decline [in divorce rates] in the coming years.”

Young people get the credit for fewer divorces because boomers have continued to divorce at unusually high rates, all the way into their 60s and 70s. From 1990 to 2015, according to Bowling Green's National Center for Family and Marriage Research, the divorce rate doubled for people aged 55 to 64, and even tripled for Americans 65 and older. Cohen's results suggest this trend, called “grey divorce,” may have leveled out in the past decade, but boomers are still divorcing at much higher rates than previous generations did at similar ages.

Philip Cohen analysis of American Community Survey data

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Millennial education, finances driving plummeting divorce rate

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