The Loneliest Young Adults Are Often New Mothers, Not Students

The 2021 Harvard Graduate School of Education survey on loneliness, run through its Making Caring Common project, produced the figure that now anchors most discussion of young adult loneliness in the United States: 61% of adults aged 18 to 25 reported serious loneliness, against 36% of Americans overall. That gap of 25 points has done a great deal of rhetorical work. It appears in advocacy materials, in press coverage, and implicitly in the U.S. Surgeon General’s 2023 advisory on social connection, which treats young adulthood as a life stage of elevated risk.

The same Harvard survey contains a second figure that gets cited far less often: 51% of mothers with young children reported serious loneliness. Mothers with young children are disproportionately concentrated in the 18-to-34 age range that policy discussions of “young adults” tend to describe. When a headline statistic like 61% is built by averaging across college students, young professionals, new parents, and everyone else under 26, it obscures rather than reveals which subgroup is actually driving the number and why.

Two different loneliness problems wearing one age bracket

The mechanisms behind loneliness in a 20-year-old student and loneliness in a 27-year-old parent of an infant are not obviously the same, and the Harvard survey’s own findings support treating them separately. Among young adults broadly, about half reported that no one had taken more than a few minutes in recent weeks to ask how they were doing in a way that felt genuine — a description that fits a breakdown in casual, low-stakes social contact: the kind that happens in dorms, workplaces, and shared living situations. Mothers with young children face a more structural version of the same problem. Caregiving for an infant or toddler restructures a day around a schedule that is largely incompatible with the informal contact — a coffee, a walk, an evening plan — that sustains adult friendship. The loneliness is not primarily about disposition or digital habits. It is about time and mobility.

Cigna’s 2020 workplace survey adds a labor-market layer that the Harvard figures do not capture. It found that 73% of workers aged 18 to 22 reported loneliness, rising above 80% among employed Gen Z workers generally, and that lonely workers missed work roughly twice as often for illness and five times as often for stress-related reasons. That survey was not designed to isolate parents, so it cannot confirm whether young working mothers show an even higher rate. But it establishes that loneliness among young adults already carries a measurable cost in absenteeism before any caregiving variable is added.

None of this is to say the 61% figure is wrong. It is an accurate description of what a defined survey instrument measured in a defined sample. The problem is what happens after publication, when a single number stands in for a population with genuinely different needs.

Where policy attention has actually gone

The institutional response to loneliness over the past six years has mostly organized itself around two other groups: older adults, and the population as a whole. The UK’s 2018 loneliness strategy, the first national strategy of its kind, embedded loneliness measurement into national statistics and funded social prescribing broadly, but its flagship interventions — befriending schemes, community activity referrals — are structured around retirement-age isolation. The National Academies’ 2020 consensus report on isolation in older adults did the same at the clinical level, recommending that health systems routinely screen for isolation among patients aged 65 and older. There is no equivalent recommendation, in any of the major reports reviewed here, that obstetric or pediatric care providers screen new mothers for loneliness, despite those providers seeing this population far more regularly than a general practitioner sees an isolated 70-year-old.

The Surgeon General’s 2023 advisory is broader in scope and names young adults as a group of concern, but its six pillars — strengthening social infrastructure, enacting pro-connection public policy, mobilizing health care, reforming digital environments, deepening research, and cultivating a culture of connection — are pitched at a population level. They do not specify caregiving-stage subgroups, and the advisory does not cite maternal loneliness as a distinct target, even though the underlying Harvard data it draws the youth figure from contains the mothers’ figure as well.

Gallup’s 2023 global survey, covering 142 countries, reinforces that the age pattern is not a U.S. artifact: adults aged 19 to 29 report the highest loneliness rate of any age group worldwide, at 27%, against 17% among adults 65 and older — the reverse of where most national policy attention has historically gone. That inversion, replicated across a very different survey instrument and a much larger geography, makes the case for closer attention to subgroups within “young adult” harder to dismiss as a U.S.-specific quirk of one survey’s wording.

What would actually settle this

None of the sources reviewed here were designed to test whether new parenthood, rather than age itself, explains a meaningful share of the youth loneliness figure. That would require a study that follows the same young adults before and after a birth, using a consistent instrument like the UCLA Loneliness Scale, and that compares loneliness trajectories for new parents against age-matched peers without children. Cross-sectional snapshots like Harvard’s, however large and well-fielded, can report a striking coincidence — high loneliness among 18-to-25s, high loneliness among mothers with young children — without being able to say how much those two figures overlap, or which one is doing more of the explanatory work in the other.

Until that work exists, the honest description of the evidence is that young adulthood and new motherhood are two separately documented risk periods for loneliness that happen to intersect in the population, and that current policy responses are built almost entirely around the age bracket, not the caregiving transition inside it.