Having lived a happy life full of meaning and purpose, why would an elderly person become chronically depressed?

Reality does not often disappear from our minds in a poof of misfortune. It seems as if it slowly drifts away like one's eyesight or hearing. Ever so slowly the ability to reason, remember or make good judgments recedes like high tide dissolves into the waves.

Many people suffer from extreme headache pain but don't realize that what they are experiencing is actually a migraine which often requires a different approach to treatment.