LFSF follows the French system and the cut-off dates for entry are different to those in the American system. At LFSF, we consider the full year of birth (Jan 01 - Dec 31) rather than the academic year (Sept 01 - Aug 31). Therefore the cut-off birthdate for entry is Dec. 31.
Make sure to discuss this topic with the Admissions team member you will be in contact with for more information.