Real age of Katharine Hepburn in Keeper of the Flame
In the movie Keeper of the Flame, Katharine Hepburn was:
34 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 Keeper of the Flame was released:
January 1, 1942
And the day in which Katharine Hepburn was born:May 12, 1907
Since movies usually don't take more than one year to be released since the beginning of the filming process, Katharine Hepburn may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.