[Psychiatric Disorders in the Oldest-Old].

The number of super-aged people over 80 years has increased with the life expectancy; however, studies on their psychiatric disorders are lacking. The characteristics of psychiatric disorders in the elderly are often complicated by physical diseases and organic changes in the brain. Psychiatric symptoms change atypically and rapidly. In the oldest-old, it is difficult to hear about the present condition of the patient and the aging process complicates drug therapy. In this paper, I outlined the diagnosis, symptoms, and treatments of: 1. psychotic disorders in the oldest-old including (A) schizophrenia comprised of (i) schizophrenia in late life and (ii) late-onset schizophrenia, (B) delusional disorder, (C) catatonia, and (D) late-onset psychotic disorders (conventional diagnosis); 2. depression; 3. apathy; 4. anxiety disorder; and 5. somatoform disorder.