Depression in the fifties.
'Depression in the fifties' is assumed to signify 'involutional melancholia', a diagnosis which was once much used but is now disappearing. It has been proposed that this category arose from what was essentially a comparison between unipolar and bipolar depressions but which ignored the differences in the modal age of onset.
D000367:Age Factors; D000368:Aged; D001714:Bipolar Disorder / Q000175:diagnosis; D002170:Canada; D003866:Depressive Disorder / Q000145:classification* / Q000175:diagnosis / Q000453:epidemiology; D003865:Major Depressive Disorder / Q000175:diagnosis* / Q000266:history; D003937:Diagnosis, Differential; D005060:Europe; D005260:Female; D049673:History, 20th Century; D006801:Humans; D008297:Male; D008875:Middle Aged; D011570:Psychiatry / Q000266:history; D014481:United States