Christie Brinkley is living proof that sunscreen is the best anti-aging trick in the book! At 71 years old, her skin looks decades younger - and she swears that daily SPF is the ultimate beauty hack. The one she keeps reaching for? A lightweight sunscreen that's beloved by both stars and beauty editors everywhere. According to New Beauty, Brinkley uses the Supergoop! Unseen Sunscreen as her "number one" hack for maintaining youthful skin. After a past skin cancer diagnosis, she emphasized that SPF "will do more for you" than almost anything else in your routine.