If you're married and 25-34 years old, you're in the minority, according to the US Census Bureau. 49.7% of US households (25-34) are comprised of married couples, down from 52+% just five years ago. So, why the shift? More 20 & 30-somethings are shacking up before marriage rather than maintaining seperate households.
The New York Times article is a little hard to follow, jumping in and out of statistics without a frame of reference. For example, the NYT doesn't reveal that the statistical decline is only among 25-34 year olds until sometime on page 2. So, I don't know if the rest of the statistics are marriage overall, or 25-34 year-olds, or what exactly, but it is interesting nonetheless.