The first male teacher I had was when I moved overseas, in year 5, in the middle aughts. That’s a 3% chance of happening if teachers had an equal gender representation, and were spread equally.

Maybe it’s gotten worse since the 60s. Maybe not. Some of this is obviously going to be random or depend on the specific school. 1% across all of primary school and preschool is low odds, but enough that it could definitely happen to enough students that you might expect to run into one of them in your lifetime. But if it were an even spread, you’d also expect to run into someone who had had all male teachers.