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Hard to believe, but one member of the Brat Pack celebrates his 50th birthday today!

The Brat Pack ruled the '80s, starring in classic films geared towards teen and young adults like "St. Elmo's Fire," "The Breakfast Club" and "Sixteen Candles" -- and today, Emilio Estevez turns the big 5-0.

Estevez is actually the second member of the core group to turn half-a-century-old. Judd Nelson celebrated his 52nd back in November.

While the Brat Pack is traditionally made up of Estevez, Nelson, Demi Moore, Molly Ringwald, Ally Sheedy, Andrew McCarthy, Anthony Michael Hall and Rob Lowe, fringe members include stars like Tom Cruise, Matt Dillon, Sean Penn and Emilio's brother, Charlie Sheen.

So, have the young, hot stars of the '80s aged well? Check out the Now & Then side-by-sides in the gallery above!

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