Some brief googling suggests that 41% of first marriages end in divorce (ex. https://www.wf-lawyers.com/divorce-statistics-and-facts/). Obviously not >50%, but certainly in the neighborhood
* Being over 25
* Having a college degree.
The people who worry about marriage because of these stats are typically in this category. I bet just by accounting for these 2 points, the numbers would plummet to the 20s if not teens.