Richard Fry and Kim Parker at Pew:
As relationships, living arrangements and family life continue to evolve for American adults, a rising share are not living with a romantic partner. A new Pew Research Center analysis of census data finds that in 2019, roughly four-in-ten adults ages 25 to 54 (38%) were unpartnered – that is, neither married nor living with a partner.1 This share is up sharply from 29% in 1990.2 Men are now more likely than women to be unpartnered, which wasn’t the case 30 years ago.
The growth in the single population is driven mainly by the decline in marriage among adults who are at prime working age. At the same time, there has been a rise in the share who are cohabiting, but it hasn’t been enough to offset the drop in marriage – hence the overall decline in partnership. While the unpartnered population includes some adults who were previously married (those who are separated, divorced or widowed), all of the growth in the unpartnered population since 1990 has come from a rise in the number who have never been married
