Is this really that US specific? Ages 6-7 seems to be pretty common for first grade¹, which gives you 13-14 for eighth.
We have P1-P7, then secondary S1 - S4, with S5 and S6 optional.
> Children start primary school aged between 4½ and 5½ depending on when the child's birthday falls.
Others are trying to say that I should somehow automatically know that most of the world uses the similar(?) age ranges. I don’t even know what age school starts at in other parts of the UK despite sharing borders with them. Maybe I’m ignorant but it’s never been information that I needed to know or retain.
Was posting the age range of US grade 8 so controversial?