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

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Jan. 28 2015, Updated 6:42 p.m. ET

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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 OKMagazine.com'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

1.

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

Selena Gomez comes across as fun and approachable. Meanwhile, Demi Lovato always seems so pulled together and wise beyond her years on "X Factor." Who do you think is older?

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2.

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

Selena's older! Both 20-year-old stars were born in 1992, but Selena's birthday is July 22 while Demi celebrates hers on August 20.

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3.

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

Angelina Jolie and Alyson Hannigan were born in the 1970s. Do you know which actress came along first?

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4.

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

Alyson did! The actress is doing something right because she just had a birthday on March 24 and looks nowhere near 39! Angelina will celebrate her 38th birthday on June 4.

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5.

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

Kristen Stewart favors a mature, serious look on the red carpet while Snooki likes to have fun. But which one is older?

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6.

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

Snooki is already 25. Kristen? She turns 23 on April 9. Waaaah!

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7.

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

Both Ethan Hawke and Jason Bateman have been in the business for a very long time. But who's been on earth longer?

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8.

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

Reality bites! Jason turned 44 in January, making him almost two years older than Ethan.

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9.

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

Mariah Carey signed with Columbia Records when she was 18 while Hilary Swank had her breakout role in 1994's "The Next Karate Kid." Who got started first?

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10.

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

Mariah takes the birthday cake! The singer just turned 43 on March 27. Hilary Swank will be 39 this summer.

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11.

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

Harry Styles and Justin Bieber are still teens. It's debatable who has won the most teenagers' hearts, but there's a clear winner on who's older.

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12.

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

Harry turned 19 on February 1—just one month before Justin!

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13.

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

Michael Buble and Justin Timberlake are both admired for their smooth moves and impressive vocals. Which do you think rocks the title of older singer?

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14.

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

Michael, 37, is older than Justin—to the tune of five years!

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15.

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

One is almost 25 while the other is 26. Can you figure out if Adele is older or younger than Kesha?

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16.

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

Adele will turn 25 in May, though her sophisticated and sometimes matronly looks would indicate she's much older—and perhaps wiser—than 26-year-old Kesha.

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