In 1960, nearly 70% of American adults were married; now only about half are. In 1960, 2/3 of 20-somethings were married; in 2008, just 26% were. College grads are now far more likely to marry (64%) than those with no higher education.
Sometimes the timing of when to file for divorce can be critical to the long-term strategy for the spouse getting a divorce. In the property context, consider whether a spouse is due to get a large bonus at work at a point in the future.