Real age of Greta Gerwig in Hannah Takes the Stairs
In the movie Hannah Takes the Stairs, Greta Gerwig was:
23 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 Hannah Takes the Stairs was released:
January 1, 2007
And the day in which Greta Gerwig was born:August 04, 1983
Since movies usually don't take more than one year to be released since the beginning of the filming process, Greta Gerwig may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.