Dementia is not part of aging. Dementia can be caused by disease, reactions to medications, vision and hearing problems, infections, nutritional imbalances, diabetes, and renal failure. There are many forms of dementia (including Alzheimer's Disease) and some can be temporary. With accurate diagnosis comes management and help. The most common late-in-life mental health condition is depression. If left untreated, depression in the elderly can lead to suicide. Here's a surprising fact: The rate of suicide is higher for elderly white men than for any other age group, including adolescents.