The Census Bureau reports 17.8 percent of households in the U.S. are of married parents with children. In 1970, the same stat was at 40 percent.

In other words, of the 130 million U.S. households, there are 23.1 million "nuclear family" homes in the U.S. -- the fewest since 1959.

Here are some other related numbers from the same report:

• Percentage of U.S. adults living with a spouse: 50 percent (87 percent in 1960).
• Average age of a woman at first marriage: 28.6 years (20.4 years in the 1950s and 60s).
• Average age of man at first marriage: 30.4 years.
• Over 37 million adults lived alone in 2021 (33 million in 2011).
• 55.4 births per 1,000 in the second quarter of 2021 (58.5 in 2019).

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Tesla and SpaceX CEO Elon Musk recently said "one of the biggest risks to civilization" is "low birthrate and the rapidly declining birthrate."

"And yet, so many people, including smart people, think that there are too many people in the world and think that the population is growing out of control," Musk continued. "It's completely the opposite. Please look at the numbers — if people don't have more children, civilization is going to crumble, mark my words."