How Old Is the Grey’s Anatomy Cast? Their Real Ages Revealed! (PHOTOS) Share Tweet Remind Me To Watch Reward Me 11 of 16 Previous Autoplay Next February 14, 2014 at 02:35PM EST by Rebecca Martin Related: Grey's Anatomy, Ellen Pompeo, Features, Patrick Dempsey, TV Stars, Chandra Wilson, James Pickens Jr., Jesse Williams, Jessica Capshaw, Justin Chambers, Kevin McKidd, Sandra Oh, Sara Ramirez, Sarah Drew, Camilla Luddington, Gaius Charles, Jerrika Hinton, Tessa Ferrer full size Credit: Michael Buckner/Getty Images for Maui Film Festival How Old Is Justin Chambers? Justin Chambers (Alex Karev) is 43 years old. His birthday is July 11, 1970.