Real age of Sarah Michelle Gellar in I Know What You Did Last Summer
In the movie I Know What You Did Last Summer, Sarah Michelle Gellar was:
19 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 I Know What You Did Last Summer was released:
January 1, 1997
And the day in which Sarah Michelle Gellar was born:April 14, 1977
Since movies usually don't take more than one year to be released since the beginning of the filming process, Sarah Michelle Gellar may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.