Real age of Billy Crudup in Princess Mononoke
In the movie Princess Mononoke, Billy Crudup was:
28 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 Princess Mononoke was released:
January 1, 1997
And the day in which Billy Crudup was born:July 08, 1968
Since movies usually don't take more than one year to be released since the beginning of the filming process, Billy Crudup may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.