Source : Webster's Revised Unabridged Dictionary (1913)

Jeunesse dor'ee \Jeu`nesse" do`r['e]e"\ [F.]
   Lit., gilded youth; young people of wealth and fashion, esp.
   if given to prodigal living; -- in the French Revolution,
   applied to young men of the upper classes who aided in
   suppressing the Jacobins after the Reign of Terror.