Real age of Billy Crystal in City Slickers
In the movie City Slickers, Billy Crystal 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 City Slickers was released:
January 1, 1991
And the day in which Billy Crystal was born:March 14, 1948
Since movies usually don't take more than one year to be released since the beginning of the filming process, Billy Crystal may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.