Depression is more common among women than men, but can occur at any age. However, the most common age at which adults experienced a major depressive episode was 20 years for both sexes, with 10.1 percent of men and up to 19.3 percent of women aged 20 years reporting such an episode in the past year as of 2017. Depression is also common among youth, with up to 20 percent of teenage females experiencing a major depressive episode in the past year as of 2017. Interestingly, but perhaps not surprisingly, depression is more common among those living below the federal poverty line, with 15.8 percent of those with a family income less than 100 percent of the federal poverty line suffering from depression, compared to only 3.5 percent of those at or above 400 percent.
Depression is a leading cause or risk factor for suicide, highlighting the importance of diagnosis and treatment. As of 2017, around 31.3 percent of adults with a major depressive episode had serious thoughts of suicide in the past year, while 11.3 percent made suicide plans, and 4.4 percent attempted suicide. Despite the seriousness of depression, it is one of the most treatable mental disorders, with the majority of patients finding relief through medication, therapy, or life changes. The most common types of professionals seen for a major depressive episode are general practitioners or family doctors, psychiatrists or psychotherapists, and psychologists. Furthermore, as of 2018, around 21.6 percent of those aged 18-29 years in the U.S. had bought medications because of anxiety or depression, with over 26.4 million prescriptions of citalopram filled in 2016 alone.