Apparently married and widowed women live longer than divorced and never married women, where as men who are married live longer than widowed, divorced and never married men. Also people who do not currently have a spouse may suffer more stress or depression and people who do not have a spouse and have children are more at risk again. The lady said for your overall health it is best to be married and without children.
I have no idea when the talk I heard was given, but this article from this year says:
“Married people are still healthier than unmarried people,” Liu said, “but the gap between the married and never-married is closing, especially for men.”
Looks like I don't have too much to be worried about for my future married life...
While trying to find who the lady I heard was and what year she gave the talk, I found some myths about marriage from the Discovery website. Myth 5 and 9 were interesting about cohabitation before marriage. Just now doing a Google search on the author, he has some stats about cohabitation in America and he even has a marriage website sitting on a New Jersey University server.