Is there a high prevalence of mental illness in the elderly?

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According to the American Psychological Association, the prevalence among older adults of a mental illness is between 20% and 22%. Some elders bring a history of mental illness with them into old age, whereas others may develop a mental disorder in late life. Symptoms of mental illness in late life also may look different for older adults. For example, depression in late life might not include visible signs of sadness.