Real age of Bill Murray in What About Bob?
In the movie What About Bob?, Bill Murray was:
40 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 What About Bob? was released:
January 1, 1991
And the day in which Bill Murray was born:September 21, 1950
Since movies usually don't take more than one year to be released since the beginning of the filming process, Bill Murray may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.