Hard to believe, but Sigourney Weaver celebrates her 62nd birthday today -- and she looks absolutely incredible.

With her long legs (she's almost 6' tall!) and still-stunning face the "Alien" star always demands attention, but she's not the only woman over 50 who seems to defy age.

Wonder Woman Lynda Carter, Raquel Welch, Jaclyn Smith and more -- see which women are frozen in time.