Depression is a serious mood disorder. It touches every part of your life and is caused by a chemical imbalance in your brain. Treatment involves medicine and counseling.
In general, only about 3% of the elderly living independently in the community will experience depression. That figure increases to around 20% to 30% of people in nursing homes or with chronic illnesses like emphysema, heart disease or diabetes.
A growing number of scientific studies indicate that optimistic people tend to live longer and have better physical and mental health than pessimistic people.