It was true in the 1980s, but there are a few caveats with it:
1.) It measures the chance that a given marriage will end in divorce, not the chance that a given person will get divorced (which was closer to 40%). The stat is skewed upwards by a few serial divorcers: 60% of second marriages end in divorce, and 73% of third marriages. [1]
2.) The divorce rate has fallen: Millenials are 18% less likely to get divorced than Baby Boomers are (largely because they're less likely to get married in the first place unless they're in a stable relationship). [2]
3.) It's heavily class-based. College educated professionals have only a ~20% chance of getting divorced, while unskilled blue-collar laborers have a ~50% chance of getting divorced. [3]