Art by Michael Stillwell Norma Kamali, ageless at 75, has called olive oil her “favorite beauty food,” and habitually carries a mini bottle with her wherever she goes. Gleaming, golden Jennifer Lopez insisted that it be a key ingredient in her new skincare line, having slathered it on her hair and body since childhood. Gwyneth Paltrow and Beyoncé consume it liberally. Sophia Loren bathes in it, literally, and look at her. Could the fountain of youth be lurking in our kitchen cupboards? It has been said that if you wait long enough, everything old is new again. In the case of olive oil...