I designed and taught a Train the Trainer “knife safety” class for the University of Scouting as one of my Wood Badge tasks. It’s been a while but I believe it still starts with Bear Scouts, who are in third grade or 9 years old to earn a Whittlin’ Chip Card.
I will say, as a retired Cubmaster and Den Leader, teaching the kids was pretty easy, but worrying about the Helicopter Parents, geez. Some of them positively swooned at the prospect of handing little Jimmy a pocketknife. They fix me with a stare, and huffily ask, but won’t he cut himself?! I’d usually reply, well, yeah, but only once.