Wikipedia
Involutional melancholia or involutional depression is a traditional name for a psychiatric disorder affecting mainly elderly or late middle-aged people, usually accompanied with paranoia. It is classically defined as " depression of gradual onset occurring during the involutional years (40-55 in women and 50-65 in men), with symptoms of marked anxiety, agitation, restlessness, somatic concerns, hypochondriasis, occasional somatic or nihilistic delusions, insomnia, anorexia, and weight loss." Involutional melancholia is not recognized as a psychiatric disorder by the DSM-5, the American Psychiatric Association's (APA) classification and diagnostic tool.
Usage examples of "involutional melancholia".
At the time of our own Civil War the chief carrier was that sufferer from involutional melancholia, that tormented man from whom knives once had to be hidden, Abraham Lincoln.
It stood as a grudging tribute to the months he had held out against involutional melancholia in the yute Blank Tanks.