Real age of Michael Douglas in The Heroes of Telemark
In the movie The Heroes of Telemark, Michael Douglas was:
20 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 Heroes of Telemark was released:
January 1, 1965
And the day in which Michael Douglas was born:September 25, 1944
Since movies usually don't take more than one year to be released since the beginning of the filming process, Michael Douglas may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.