Lucy Liu is turning 50, but you wouldn’t know it to look at her. And the same goes for two other stars celebrating early-December birthdays—Julianne Moore, who’s turning 58, and Marisa Tomei, 54. Click through for photos of all three and other stars who seem somehow untouched by time.

The Emmy winner has hardly changed since her breakout role as Ling Woo on “Ally McBeal.” One of her secrets is simple sun protection. “I work long hours and am constantly out in the elements,” Lucy Liu says. “I have to be very rigorous about reapplying sunscreen and wearing a hat and handkerchief around my neck and chest.”