Divorce360.org has a divorce calculator that lets you calculate the odds of your marriage ending in divorce. The basic finding is that college graduates who did not marry very young have good odds of their marriages lasting. Different generations have different odds, which are built in to the calculator.
Based on old general data on who reads blogs, and anecdotal but very current information on who reads this blog, I would say confidently that the Gruntled Center audience is in the good end of the distribution of lasting marriages. Nothing is guaranteed, of course, but your odds are good. So relax and enjoy.