Real age of Hilary Duff in Cheaper by the Dozen 2
In the movie Cheaper by the Dozen 2, Hilary Duff was:
17 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 Cheaper by the Dozen 2 was released:
January 1, 2005
And the day in which Hilary Duff was born:September 28, 1987
Since movies usually don't take more than one year to be released since the beginning of the filming process, Hilary Duff may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.