Preschool to 3rd grade: Zero
4th grade to 5th grade: Zero
6th grade to 8th grade: One
9th grade to 12th grade: Zero (I was homeschooled throughout high school.)
I only counted people that I talk to monthly. I'm friends with many former classmates on Facebook, but our only correspondence is a happy birthday message once a year to each other (well, the ones that deserve my time).
Honestly, school friends are really useless and you most likely won't be talking to any within 3-5 years of graduating.
