Real age of J.K. Simmons in True Grit
In the movie True Grit, J.K. Simmons was:
54 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 True Grit was released:
January 1, 2010
And the day in which J.K. Simmons was born:January 09, 1955
Since movies usually don't take more than one year to be released since the beginning of the filming process, J.K. Simmons may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.