Definition of "forties"

forties

noun
1. plural of forty
noun
plural only
1. The decade of the 1840s, 1940s, etc.
2. The decade of one's life from age 40 through age 49.
3. (temperature, rates, plural only) The range between 40 and 49.
adjective
not comparable
1. From or evoking the 41st through 50th years of a century (chiefly the 1940s).
  Quotations
  Like any big modern city, Scott's Los Angeles of 2019 is saturated with technologies; in fact, it is most striking for its layering of technologies, styles, lifestyles and ethnicities, which range from oriental peasant altars and cookfires through forties hats and building facades to off-world colonies and androids.
  1991, Judith B. Kerman, “Technology and Politics in the Blade Runner Dystopia”, in Judith B. Kerman, editor, Retrofitting Blade Runner: Issues in Ridley Scott's Blade Runner and Philip K. Dick's Do Androids Dream of Electric Sheep?, 2nd edition, University of Wisconsin Press, page 16