Is 40 the new 20?

Age, shmage — these celebs are getting hotter as they get older!

At 42, nobody would blame J.Lo for taking it a little easy. You know, cut back on the sexiness, and slow down on that career. Instead, she's looking better than ever (did you see her at the Oscars?!) and is currently living it up with her 24-year-old beau, Casper Smart, following her split from husband Marc Anthony.

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