However, in older adults, there usually are understandable reasons for depression. As the brain and body age, a number of natural bio-chemical changes begin to take place. Changes are the result of aging, medical illnesses or genetics may put the older adult at a greater risk for developing depression. But even when someone is struggling with a chronic illness such as arthritis, it is not natural to be depressed. Depression is defined as an illness if it lasts two weeks or more and if it affects one's ability to lead a normal life.
Many factors can contribute to the development of depression.
Often people describe one specific event that triggered their depression, such as the death of a partner or loved one, or the loss of a job through layoff or retirement. What seems like a normal period of sadness or grief may lead to prolonged, intense grief that requires medical attention. The loss of a life-long partner or a friend is a frequent occurrence in later life. It is normal to grieve after such a loss. If any of these symptoms are triggered by a loss, a physician should be consulted.