Young was born as Markell V. Efimoff in Everett, Washington, on New Year's Day 1991. He began acting at the age of nine. Three years later, he moved to Los Angeles, California, to pursue a proper acting career. His first significant on-screen credit was a small role in two episodes of the HBO-produced series "Six Feet Under." He has since made appearances in TV shows such as "The OC," "Dexter," "Big Love," "Children's Hospital," "Heroes," "Secret Life of the American Teenager," "Cold Case," "ER," "CSI: Crime Scene Investigation," "Criminal Minds," and "The Inbetweeners." Young's film credits include Sex Drive, Happiness Runs, The Lucky Ones, and We're the Millers.

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