Young adults often make major life decisions based on when they expect to start a family, yet many misjudge how their twenties will actually unfold. New economic research finds that relationship status and physical attractiveness, particularly among women, are strongly linked to how accurately people predict early parenthood.
The study, published in The Economic Journal, connected young adults’ expectations about having children with their later outcomes using long-term survey data. It found that people without a stable partner substantially overestimated their chances of becoming parents by age 30, while married participants made considerably more accurate predictions.
Tracking expectations into early adulthood
Economists Yifan Gong, Tyler Skura, Ralph Stinebrickner and Todd Stinebrickner used data from the Berea Panel Study, which follows students from Berea College in Kentucky. They examined 355 participants who had no children at age 24 and followed them for another six years.
At age 24, participants estimated, in percentage terms, the probability that they would have their first child at different future ages. Researchers later compared those predictions with self-reported birth histories through age 30, allowing them to measure the gap between expectations and actual outcomes.
Across the full sample, young adults were overly optimistic about becoming parents during their twenties. On average, they predicted a 57.6% chance of having a child before age 30, but only 36.1% actually did.
Relationship status drives the accuracy gap
The size of this gap differed considerably depending on whether participants were married, dating or single at age 24. Married individuals made relatively accurate predictions, while people who were dating or single tended to overestimate their likelihood of early parenthood.
Married participants predicted a 76% probability of having a child before age 30, and 69.2% actually became parents. Those with a boyfriend or girlfriend estimated a 57.6% chance, while only 32.2% had a child by 30.
Single participants showed the largest gap. They predicted a 42.8% probability of becoming parents before 30, yet only 13.1% actually did so.
The researchers then examined whether inaccurate expectations about marriage could help explain the discrepancy. Single participants estimated nearly a 50% probability of being married by age 30, but only 21.5% were actually married by that point. This optimism about future marriage accounted for much of the difference between their expected and actual fertility.
When participants reached 30 with fewer children than they had anticipated, they also tended to revise their expectations for lifetime fertility downward, showing how family expectations can change as circumstances unfold.
Attractiveness and women’s early motherhood
The researchers also examined whether physical attractiveness was associated with early parenthood. Approximately 47 peers rated each participant’s college ID photograph on a five-point attractiveness scale, providing a measure of how participants were perceived by people in a similar social environment.
Higher attractiveness ratings were associated with a greater probability of becoming a parent before age 30, but the relationship was concentrated primarily among women. For women, a one-point increase on the five-point attractiveness scale was associated with a substantial increase in the probability of early motherhood.
Among men, peer-rated attractiveness had little predictive value for becoming a father during their twenties. The gender difference indicates that attractiveness was associated differently with early fertility outcomes for men and women in this particular sample.
Participants’ expectations also reflected this pattern. Women with higher attractiveness ratings predicted greater chances of becoming mothers before 30, broadly corresponding with their later outcomes. Men did not substantially incorporate attractiveness into their fertility expectations, consistent with its limited relationship with their actual early fatherhood.
Attractiveness also remained relevant among married women. Married women rated above average in attractiveness predicted early motherhood with particularly high accuracy, while married women with lower attractiveness ratings tended to overestimate their probability of having a child before 30.
Limits and broader implications
The findings come from a relatively small and specific population: students from Berea College, a liberal arts college in Kentucky with a largely lower-income student body. The results therefore may not generalize fully to students at more affluent institutions, people who do not attend college or populations in different social and cultural settings.
Attractiveness was also assessed using a single college ID photograph. Such ratings cannot capture other characteristics that may influence attraction and relationship formation, including style, charisma, personality or changes in appearance over time.
The researchers accounted for self-reported characteristics including intelligence, communication skills and outgoingness, and the association between female attractiveness and early motherhood remained. However, other unmeasured characteristics could still contribute to the observed relationship.
Expectations about marriage and parenthood can potentially influence important decisions involving education, careers, finances and other areas of adult life. Understanding where expectations systematically diverge from later outcomes could therefore provide useful information about how young adults plan for their futures.
The article, titled Fertility Beliefs and Outcomes: The Role of Relationship Status and Attractiveness, adds to research examining how expectations about major life events compare with what subsequently happens.
Its findings show that relationship status at age 24 was strongly associated with the accuracy of predictions about becoming a parent by 30. They also reveal a notable gender difference in this sample: peer-rated physical attractiveness was strongly related to early parenthood among women but had little predictive value for men.
