According to the Pew Research Center, the divorce rate among those 50 and older doubled between the 1990s and the mid-2000s. This so-called "gray divorce" is even more prevalent among people in their second or later marriages -- and there are a lot of those in the Baby Boom generation.
According to the Society of Actuaries, half of women and a third of men who are now in their 50s will live to be 90. Among married people, there is a 50-percent chance that one of the spouses will live to 92. That means that many people who marry at 30 will be together for 60 or more years. If you're not in a happy marriage, that can seem like a very long time.