Youth’s upbeat grin, aging’s drooping chin

Behold that fresh youthful look:
Youth’s upbeat breathless grin
crisp cover of unread book
sculptured, jutting out chin

Behold the wizened old look:
aging’s out-of-breath grin
thumbed cover of well read book
sagging skin, drooping chin

At which point cannot count on audacity
but hope for tenacity, veracity