Dementia (from L.demens), commonly referred to as insanity or madness, is usually associated with a progressive loss or weakening of self control, thought and/or reason. In its more serious forms, dementia is often mistakenly referred to as mental imbecility or even idiocy.
... as 1912.
Writers and artists in the United States such as F. Scott Fitzgerald, John Held, Jr.[?], and Anita Loos[?] popularized the flapper look and lifestyle ...