Real age of Andy Serkis in 13 Going on 30
In the movie 13 Going on 30, Andy Serkis was:
39 years old
That was the real age of the celebrity according to our calculation.
The calculation of the shown age took into account the first day of the year in which the movie 13 Going on 30 was released:
January 1, 2004
And the day in which Andy Serkis was born:April 20, 1964
Since movies usually don't take more than one year to be released since the beginning of the filming process, Andy Serkis may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.