Half of young adults now report 14 or more poor mental health days per month. That number was 39.5% in 2016.

The rise isn't subtle, and it isn't uniform. Among adults 65 and older, the same measure moved from 14.7% in 2016 to 18.4% in 2024, an increase of 3.7 percentage points. Among 18-to-24-year-olds, it moved from 39.5% to 50.6%, an increase of 11.1 points. The gap between young adults and seniors was already wide. It's now wider.

Young Adults Crossed 50% During the Pandemic Years and Stayed There

The trajectory for 18-to-24-year-olds shows a consistent climb through the late 2010s, a brief plateau in 2020, and then a jump that held. By 2023, 51.7% of young adults reported 14 or more poor mental health days in the past month. The 2024 figure of 50.6% suggests that peak wasn't a one-year anomaly.

The 2020 number (44.5%) is the one outlier in an otherwise upward line. It's lower than 2019's 46.7%, which is counterintuitive given the pandemic's timing. The 2023 and 2024 readings, both above 50%, represent the highest values in this dataset by a wide margin.

For context: in 2016, fewer than 1 in 6 adults over 65 reported this level of mental health burden. By 2024, that figure had risen to 18.4%, still less than half the rate seen in young adults.

The Gender Gap Among 18-to-34-Year-Olds Has Widened, Not Closed

Among adults aged 18 to 34, women have consistently reported higher rates of frequent poor mental health days than men. In 2016, the gap was 8.2 percentage points (39.2% for women versus 31.0% for men). By 2024, that gap had grown to 10.3 points (53.0% for women versus 42.7% for men).

Both sexes saw substantial increases over the period. Men in this age group went from 31.0% to 42.7%, a rise of 11.7 points. Women went from 39.2% to 53.0%, a rise of 13.8 points. The 2020 gap of 12.6 points was the widest in the dataset, though the 2023 and 2024 readings show it narrowing slightly from that peak.

The Older-Adult Comparison Makes the Young-Adult Numbers Harder to Dismiss

One common response to mental health prevalence data is to attribute rising rates to increased awareness or changing willingness to report distress. The older-adult trend complicates that argument. Adults 65 and older are also surveyed in the same instrument, and their rates rose too, from 14.7% in 2016 to 18.4% in 2024. But their increase was modest compared to the 11-point climb among 18-to-24-year-olds.

If reporting norms alone were driving the numbers up, you'd expect a more uniform rise across age groups. Instead, the data shows a generation-specific pattern. Young adults in 2024 are reporting frequent poor mental health days at nearly three times the rate of adults over 65. In 2016, the ratio was about 2.7 to 1. The gap is growing in absolute terms and holding in relative terms.

What the data can't tell us is whether the 18-to-24-year-olds who were 14 in 2016 are the same cohort now reporting distress at 50%-plus rates as they age into their mid-twenties, or whether each successive wave of young adults is entering adulthood in worse mental health than the one before.