Romero grew up in Bradley Beach, New Jersey, and went to Bradley Beach Elementary School, Asbury Park High School, the Collegiate School, and the Riverdale Country Day School. After his parents lost their sugar-import business and suffered losses in the Wall Street crash of 1929, Romero's Hollywood earnings allowed him to support his large family, all of whom followed him to the American West Coast years later. Romero, who referred to himself as "a Latin from Manhattan", lived on and off with various family members for the rest of his life.