Real age of Mary Pickford in From the Bottom of the Sea
In the movie From the Bottom of the Sea, Mary Pickford was:
18 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 From the Bottom of the Sea was released:
January 1, 1911
And the day in which Mary Pickford was born:April 08, 1892
Since movies usually don't take more than one year to be released since the beginning of the filming process, Mary Pickford may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.