That was over 31 years ago in 1990.
Today he is 40, and has starred in 26 movies in total, 21 since Home Alone was released.
In Home Alone, I think Macaulay Culkin looks:
Home Alone scores 7.1 out of 10 on The Movie Database.
Macaulay Culkin's first acting role was as 'Cy Blue Black' in Rocket Gibraltar, released in 1988 when he was 8.