How old was Jennifer Garner in 13 Going on 30?

Curiosity about a celebrity’s age during filming is more common than you’d think. Knowing that can offer insight into their career stage and personal growth. Here’s the answer to that particular curiosity.

In the movie 13 Going on 30, Jennifer Garner was at the age of:

31 years old

Based on our estimate, that was the actual age of the celebrity at the time.

This age was calculated based on the beginning of the release year of 13 Going on 30:

January 1, 2004

And the day Jennifer Garner was born:

April 17, 1972

Since movies are typically released within a year of filming, Jennifer Garner could have been a year younger or older than the displayed age during certain scenes.