Real age of Michael Biehn in The Abyss
In the movie The Abyss, Michael Biehn was:
32 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 The Abyss was released:
January 1, 1989
And the day in which Michael Biehn was born:July 31, 1956
Since movies usually don't take more than one year to be released since the beginning of the filming process, Michael Biehn may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.