Roughly 4% of the world’s population has depression, which translates to about 332 million people. In the United States, the number is significantly higher: 13.1% of adolescents and adults age 12 and older show signs of depression in any given two-week period. These figures vary widely depending on age, sex, and how depression is measured, so the full picture is more nuanced than a single number suggests.
Global vs. U.S. Prevalence
The World Health Organization estimates that 5.7% of adults worldwide experience depression, with rates climbing to 5.9% among adults over 70. The global 4% figure includes children and adolescents, who are diagnosed at lower rates overall, which pulls the number down.
The United States reports notably higher rates than the global average. CDC data from August 2021 through August 2023 found that 13.1% of Americans age 12 and older had depression during a given two-week window. That’s a sharp increase from a decade earlier, when the rate was 8.2% in 2013-2014. The jump reflects a real trend: depression has become substantially more common in the U.S. over the past ten years, with the COVID-19 pandemic accelerating a pattern that was already underway.
How Rates Differ by Sex
Depression affects women and girls at considerably higher rates than men and boys across nearly every age group. In the U.S., 16.0% of females age 12 and older have depression compared to 10.1% of males. Globally, the WHO reports a similar gap: 6.9% of adult women versus 4.6% of adult men.
The disparity is most dramatic among teenagers. Among adolescent girls ages 12 to 19, 26.5% meet the threshold for depression, more than double the 12.2% rate in boys the same age. In young adults ages 20 to 39, the gap narrows somewhat (19.0% for women, 14.3% for men), and by age 60 and older it settles to 10.6% for women and 6.5% for men. Hormonal differences, social pressures, and higher rates of trauma exposure in women all contribute to this pattern, though researchers also note that men are less likely to report depressive symptoms or seek diagnosis.
Depression Across Age Groups
Young adults carry the highest burden. Women ages 20 to 39 have the single highest depression rate of any adult group at 19.0%, and men in the same age range aren’t far behind at 14.3%. Adolescent girls ages 12 to 19 have an even higher rate at 26.5%, a figure that has drawn increasing attention from public health officials.
Depression rates generally decline with age. Adults 40 to 59 show rates of 13.8% (women) and 7.9% (men), while those 60 and older drop to 10.6% and 6.5% respectively. Among adults over 70 specifically, the WHO puts the global rate at about 4%. This doesn’t mean older adults are immune. Depression in older people often goes unrecognized because symptoms like fatigue, sleep changes, and loss of interest can overlap with other health conditions or get dismissed as normal aging.
Mild, Moderate, and Severe
Not everyone with depression experiences it the same way. CDC data from 2019 broke down the severity among U.S. adults using a standard screening tool. Of all adults surveyed, 11.5% had mild depressive symptoms, 4.2% had moderate symptoms, and 2.8% had severe symptoms. In other words, most people who screen positive for depression fall on the milder end of the spectrum, though even mild depression can meaningfully affect daily functioning, relationships, and quality of life.
Severe depression, affecting nearly 3 in 100 adults, is the form most associated with inability to work, withdrawal from relationships, and risk of self-harm. It typically requires professional treatment, often combining therapy and medication. Moderate depression sits in between and can fluctuate, sometimes improving on its own and sometimes worsening without support.
Why Rates Are Rising
The increase from 8.2% to 13.1% in the U.S. over roughly a decade is one of the most striking trends in recent public health data. Several factors overlap. Social media use has reshaped how people, especially young people, experience social comparison and self-worth. Economic instability, loneliness, and reduced access to community support structures have all worsened. The pandemic played a clear role as well, with isolation, grief, and disrupted routines pushing many people into their first depressive episode.
Better awareness and reduced stigma also contribute to the rising numbers. More people are willing to report symptoms on surveys and seek diagnosis than in previous decades, which means some of the increase reflects cases that previously went uncounted rather than truly new cases.
The Cost of Untreated Depression
Depression is one of the leading causes of disability worldwide, and its economic footprint is enormous. The WHO estimates that 12 billion working days are lost globally each year to depression and anxiety combined, costing roughly $1 trillion annually in lost productivity. That figure accounts for absenteeism (missing work entirely) and presenteeism (showing up but functioning at a reduced capacity), which is actually the larger share of the cost.
For individuals, untreated depression tends to become self-reinforcing. It erodes motivation to exercise, socialize, or maintain routines, all of which are protective against worsening symptoms. Episodes that go unaddressed also tend to recur. About half of people who experience one major depressive episode will have at least one more, and each subsequent episode increases the likelihood of another.