Real age of Joseph Mazzello in The Hollow
In the movie The Hollow, Joseph Mazzello was:
20 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 The Hollow was released:
January 1, 2004
And the day in which Joseph Mazzello was born:September 21, 1983
Since movies usually don't take more than one year to be released since the beginning of the filming process, Joseph Mazzello may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.