Real age of John Hughes in Dennis the Menace
In the movie Dennis the Menace, John Hughes was:
42 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 Dennis the Menace was released:
January 1, 1993
And the day in which John Hughes was born:February 18, 1950
Since movies usually don't take more than one year to be released since the beginning of the filming process, John Hughes may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.