The following data can see depression, especially the proportion of senile depression in the population, which shows that senile depression is a problem that cannot be ignored in today's society.
Depression among older people in Europe （2004）
Meta-analysis of all 13,808 subjects yielded a mean level of depression of 12.3% (95% CI 11.8-12.9), 14.1% for women (95% CI 13.5-14.8) and 8.6% for men (95% CI 7.9-9.3).
Health Survey for England - Health of Older People （2005）
12% of women and 9% of men reported low levels of psychosocial wellbeing based on 12 items measuring general levels of happiness, depressions and anxiety, sleep disturbance and the ability to cope of the last few weeks.
The geriatric depression scale = GDS10
Both figures are too old to be used. I also searched for other data.
Depression is a common illness worldwide, with an estimated 3.8% of the population affected, including 5.0% among adults and 5.7% among adults older than 60 years. Approximately 280 million people in the world have depression.
Although there are known, effective treatments for mental disorders, more than 75% of people in low- and middle-income countries receive no treatment . Barriers to effective care include a lack of resources, lack of trained health-care providers and social stigma associated with mental disorders. In countries of all income levels, people who experience depression are often not correctly diagnosed, and others who do not have the disorder are too often misdiagnosed and prescribed antidepressants.
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