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OK! Quiz: Can You Guess Who's Older? Test Your Knowledge of Eight Sets of Stars

Credit: Splash News/INF Photo/Mariah Carey via Twitter

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How well do you know your favorite celebrities? Who's older: Demi Lovato or Selena Gomez? Adele or Kesha? Snooki or Kristen Stewart?

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Some stars seem older just because they've been around forever, while others are aging because they've been living the glamorous life a little too hard.

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Still, a lot of celebrities have the cutest little baby faces or they take really good care of themselves.

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Click through's photo quiz and see how you do on guessing which star is older!

How did you do? Tell us in the comments section or on Twitter @OKMagazine