Why is depression sometimes underdiagnosed and untreated among the elderly?

Why is depression sometimes under diagnosed and untreated among the elderly?

Depression in older adults is a serious problem that is often underdiagnosed. This is because it often co-occurs with other serious illnesses and elderly people may be less willing to talk about feelings of sadness and hopelessness. The exact causes of depression in the elderly are unknown, but it may result from factors such as environment and family history. Fortunately, even in its most severe form, depression is highly treatable.

Many people have the mistaken idea that depression in the elderly is ...