jeunesse dor�e

from The Century Dictionary.

• noun Literally, the gilded youth of a community; rich and fashionable young men, especially those who are luxurious and prodigal in their way of living; specifically, in French history, a group of fashionable members of the reactionary party, in the period after the 9th Thermidor, 1794.

from the GNU version of the Collaborative International Dictionary of English.

• 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.