Real age of Robert De Niro in Trois chambres à Manhattan
In the movie Trois chambres à Manhattan, Robert De Niro 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 Trois chambres à Manhattan was released:
January 1, 1965
And the day in which Robert De Niro was born:August 17, 1943
Since movies usually don't take more than one year to be released since the beginning of the filming process, Robert De Niro may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.