They may worry about Alzheimer's Disease because they can't remember simple things. Many elderly people experience anxiety over personal finances and life changes. They may have panic attacks, sudden overwhelming feelings that something bad is going to happen, or a racing heart beat. Some may hyperventilate or find themselves struggling to catch their breath. Others break into sweats.
Depression is also very common.
Symptoms may include increased or decreased sleeping or eating, and a loss of interest in hobbies and activities. Seniors suffering from depression may avoid contact with the people they love, shunning their remaining friends and relatives. When older people are unsure of themselves, when they're not functioning well, they can develop a fear of being around people and of going out in public. The most alarming sign is when they isolate themselves. Social isolation is the single greatest risk for suicide.