Macaulay Culkin was 10 years old during the filming and release of Home Alone, but he was born on August 26, 1980, so he turned 10 in August 1990 and portrayed Kevin McCallister at age 10 in the film, which was released in November 1990.

Context and quick breakdown:

• The film Home Alone was released in the United States on November 16, 1990, and stars Macaulay Culkin as Kevin McCallister, an 8-year-old in the story’s timeline, but Culkin himself was 10 at the time of production and release.

• Culkin’s birth date is August 26, 1980, which confirms his age during the 1990 production window and release year.

• In the film’s own dialogue, Kevin is described as being 8, but the actor playing him, Culkin, was about two years older in real life at the time, i.e., 10 during filming and release.