21. Bianca Lawson
Most Memorable Roles: Maya St. Germain on Pretty Little Liars
What do Buffy the Vampire Slayer, Dawson's Creek, Pretty Little Liars, and The Vampire Diaries have in common? These shows have all featured Bianca Lawson, who officially doesn't age. Ever since she appeared in Saved by the Bell: The New Class in 1993, this 33-year-old has been pulling off teen roles for two decades now—like a tantalizing female version of Peter Pan.