How Old Is the Grey’s Anatomy Cast? Their Real Ages Revealed! (PHOTOS) 3 of 12 Previous Autoplay Next Share Tweet July 2, 2013 at 04:40PM EDT by Alissa Kombert Related: Grey's Anatomy, Ellen Pompeo, Patrick Dempsey, TV Stars, Chandra Wilson, Chyler Leigh, Eric Dane, James Pickens Jr., Jesse Williams, Justin Chambers, Kevin McKidd, Sandra Oh, Sara Ramirez, Alex Karev, Arizona Robbins, Callie Torres, Cristina Yang, Derek Shepherd, Lexie Grey, Mark Sloan, Meredith Grey, Miranda Bailey, Owen Hunt, Richard Webber full size Credit: Bryn Lennon/Getty Images How Old Is Patrick Dempsey? Patrick Dempsey (Derek Shepherd) is 47 years old. He's 4 years older than his wife on the show, Ellen Pompeo (Meredith Grey).