Real age of Jonathan Banks in Gremlins
In the movie Gremlins, Jonathan Banks was:
36 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 Gremlins was released:
January 1, 1984
And the day in which Jonathan Banks was born:January 31, 1947
Since movies usually don't take more than one year to be released since the beginning of the filming process, Jonathan Banks may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.