An interesting analysis of census data from Pew Research Center reveals the changing makeup of American households.
The decline in marriage rates across the US — and many other countries — has been well documented. In 1990, 67% of the US population aged 25-54 were living with their spouse. Today that number is 53%.
But what's interesting is that, although there are more people living with partners than before, they don't explain the total drop in the married population. Indeed, the number of "unpartnered" adults — those not married nor living with a partner — has gone up, to almost 40% of the population of the 25-54 demographic.