This links to a video by Andrew Zuckerman of famous people telling what they think wisdom is. Click on "the portraits" and you'll never be afraid of aging again. Time creates much more interesting faces than youth. If you're pressed for time go right to the end and click on the portrait of Andrew Wyeth. That's the most stunning face in the group.
We get so used to Hollywood surgically or digitally enhanced faces. We need expressive faces - faces that say something - faces that have lived.