In 1960, 72% of adults were married, and over 90% would go on to marry. HR policies and management practices back then catered to nuclear families with a lone, male breadwinner.

Today, dual-career couples and working mothers are common, largely due to the growth of women in the workforce in the second half of the 20th century.

To recruit and retain talent, businesses have expanded family-friendly policies by offering flexible work hours, paid parental leave and subsidized child care. These are much-needed improvements, though many employers still lag in offering them.

Today, another demographic shift also demands employers’ attention: the growing share of the workforce that is single – particularly those without dependents. About 1 in 3 American adults haven’t gotten married by midlife.

More adults aren’t married

The workplace has always included recent grads, never-married professionals, divorced empty nesters and widowed retirees. But these categories now represent a far larger share of the labor force than they did a generation ago – and people move in and out of them throughout their lives.

As a behavioral economist and business school professor, I study what I call the “Solo Economy” – how institutions and markets are adapting, or failing to adapt, to this shift.

Workplace policy is one area where the gap is especially wide.

Today, 46% of U.S. adults are unmarried. Half of these unmarried Americans aren’t interested in dating. Population forecasters project that about 25% of millennials and 33% of Gen Z will never marry.

Around 29% of U.S. adults live alone – the most common household type in the country. Compare that to 1960, when the median age of first marriage was 20 for women and 22 for men, and single-person households were relatively rare.

The average age of getting........

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