Real age of Don Johnson in Zachariah
In the movie Zachariah, Don Johnson was:
21 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 Zachariah was released:
January 1, 1971
And the day in which Don Johnson was born:December 15, 1949
Since movies usually don't take more than one year to be released since the beginning of the filming process, Don Johnson may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.