The Institute for Family Studies (IFS) is warning in a new report that the U.S. could be headed for population decline within the next few decades. Researchers say the looming demographic shift isn’t because Americans no longer want families, and that, in fact, most people aspire to have more children than they actually have.
Americans still say they want to have roughly 2.4 children while actual fertility has fallen below 1.6 children per woman, one of the widest gaps between desired and actual family size in modern history. Lyman Stone, director of IFS’ Pronatalism Initiative and co-author of the report, told Fox News Digital that the discrepancy is closely tied to family formation.
Stone said Americans haven’t given up on having children. Instead, as more people delay marriage or forgo it altogether, many fall short of the family size they envisioned.
“What most people want is family,” Stone said.
He noted that people who marry earlier are far more likely to reach their family size goals.
“Conditional on marrying early enough, people almost always hit their fertility desires,” he said. “The main factor shaping undershooting is just not getting married.”
Stone pushed back on the idea that the decline in birth rates was linked to an increase in medical infertility, saying that Americans have delayed starting their families. According to a 2025 statement from the U.S. Census Bureau, the median age at first marriage increased to 30.8 for men and 28.4 for women, compared to 1975 when the ages were 23.5 and 21.1.
“There’s not been a dramatic decline in health or reproductive ability. Humans are able to reproduce like we always have, but the choice to delay is exposing more people to the difficulty of age, and it does change their biological options in an adverse way,” he said. “It’s better to start earlier.”
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IFS also found “peer culture” to be a key factor in fertility. Young Americans with highly supportive friendships reported wanting larger families. The report noted that for Americans under 30, respondents with more supportive friends said they would like to have roughly 2.8 children, compared with 1.7 children among those with the least supportive friend groups.
Stone said the researchers have yet to analyze whether having friends who are married and have children makes someone more likely to start a family, though he suspects there is likely a connection.
Delayed family formation and the social influences highlighted in the report explain why Americans are having fewer children than they want, according to the report. The IFS believes this trend could reshape the country’s demographic future.
The report warns that if things do not change, the U.S. could hit peak population in the 2050s before sliding into a steady decline. S
