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Older actors and actresses downplaying their real age to play a much younger character is nothing new. Remember Rizzo in "Grease"? The actress who played the 18-year-old was nearly twice her Pink Lady's senior during filming of the 1978 musical. The same goes for Michael J. Fox. ... more His character, Marty McFly, was 17 while Fox was 29 when "Back to the Future Part III" wrapped in 1990. Sissy Spacek was 26 when she portrayed the lead character in 1978's "Carrie," and 29-year-old Stacey Dash played ditzy 17-year-old Dionne to valley girl perfection in "Clueless." Now, there's a new crop of older thespians with baby faces playing younger characters on the big and small screens. Don't let their mugs fool you. Can you guess their real ages?