unyouthful

un- +‎ youthful

unyouthful (comparative more unyouthful, superlative most unyouthful)

1. Not youthful.
   • 2007 March 18, David Kamp, “With the Band”, in New York Times‎:

     And with sly humor, rather than the acrid cynicism that usually characterizes showbiz satire, Lethem follows through with the immediate consequence of such a magical moment: “When no one was looking, the lip of the stage had been approached by men of guile and influence, unyouthful men in youthful clothes.”