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Use "unyouthful" in a sentence
"It's not just he weight, which is much more obvious when she's naked, it's the general "unyouthful" look she has."
"As yet it had not sunk into his consciousness that his unyouthful knowledge of life in the raw would be the means of success in literature; therefore he discoursed of imaginary things and persons, lords and ladies, days of chivalry and what not — anything but out of his priceless first-hand lore."
"This calculating, unyouthful outlook was repugnant to Mahony, and for all his goodwill, the longer he listened to Ned, the cooler he felt himself grow."