Stark was born in New York City. His father, Alan Stark (1924–2008), was an actor. Don's mother, Debra Antorelli (1926–1993), was a homemaker.
As a child, Stark and his family relocated to Los Angeles, California, settling in the San Fernando Valley. Stark graduated from Grover Cleveland High School in Reseda, California, in 1972. He played football for the school team, and he won leading roles in the theater arts department. He portrayed John in Dark of the Moon, Sky Masterson in Guys and Dolls, Tevye in Fiddler on the Roof, and, in an award-winning Shakespeare Festival scene, the title role in Othello.
After high school, Stark attended California State University, Northridge, originally studying business before deciding to major in theater arts.

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