How old was Johnny Galecki in Christmas Vacation?

It's common to wonder how old a celebrity was when they starred in a particular film. Knowing that can offer insight into their career stage and personal growth. We’re about to uncover that piece of the puzzle.

The age of Johnny Galecki while starring in Christmas Vacation was:

13 years old

That number reflects the celebrity’s real age when the movie was made.

The shown age corresponds to the celebrity’s age at the very start of the release year of Christmas Vacation:

January 1, 1989

And the date of birth of Johnny Galecki, that is:

April 30, 1975

Since the release usually follows filming within a year, the age of Johnny Galecki during the actual shoot may have been a year more or less than indicated.