When do you start hight school in your country?

When do you start hight school in your country?
In england it starts from grade 7 to grade 12, in saudi arabia, it starts from grade 10 to grade 12.
How about in your country??

grades 9-12 but we have junior high from 6-8

USA 9-12

USA 9 or 10-12.

in arizona (USA) it's 10-12 emel. pre-6, middle 7-9

libbyroxmysox same in saudi arabia
any other countries??

9-12 high school.

Canada grade 10 to 12
We also have junior high which is from 7 to 9 which not a lot of other countires have

In Australia, primary school goes from years 1 to 6, and then high school is from year 7 to year 12.

What age are people in these grades, as in what ages are you at high school for?

as far as I know the british system is 7-13 (did they change this?)

In Scotland, high school starts in the English 8th grade... I think.