As far as we're concerned, these stars have found the Fountain of Youth! Jay-Z, Jennifer Lopez and Gwen Stefani are all over 40, though they all have youthful glow that so many people try to get with expensive serums and surgeries. As far as they are concerned, you can take your Botox and shove it.

We could've also sworn that celebs like M.I.A. and Redfoo were all livin' it up in their 20s. Think again! All three are in their 30s, and we would never been any the wiser. Then there's Carly Rae Jepsen... If you told us she was 17, we would take your word for it, no questions asked -- but she certainly is not!

You can find out exactly how old all of these well-preserved celebs are in this list of Stars Who Are Older Than You Think. Go ahead, start getting your mind blown by clicking through below.

Jennifer Lopez
Birthday: July 24, 1969
Age: 44

Michael Buckner, Getty Images

Jay-Z
Birthday: Dec. 4, 1969
Age: 43

Larry Busacca, Getty Images

Gwen Stefani
Birthday: Oct. 3, 1969
Age: 43

John Sciulli, Getty Images

Eminem
Birthday: Oct. 17, 1972
Age: 40

Larry Busacca, Getty Images

Mariah Carey
Birthday: March 7, 1970
Age: 43

Maury Phillips, Getty Images

David Guetta
Birthday: Nov. 7, 1967
Age: 45

Ethan Miller, Getty Images

M.I.A.
Birthday: July 18, 1975
Age: 38

Dimitrios Kambouris, Getty Images

Redfoo of LMFAO
Birthday: Sept. 3, 1975
Age: 37

Kevin Winter, Getty Images

Carly Rae Jepsen
Birthday: Nov. 21, 1985
Age: 27

Ken Ishii, Getty Images

Dr. Dre
Birthday: Feb. 18, 1965
Age: 48

Isaac Brekken, Getty Images