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This is clearly aimed at Americans only.

Well, "Wait for 8th or whatever the similarly-aged grade level is in your area" doesn't sound quite as punchy.

This is applicable to anyone, anywhere, though sure, it's targeted at a US audience.

The point is that this website is not applicable to anyone, anywhere, since the core message is strictly US-only.

If the authors were aware of this, they may have focused their message on, eg the children's age, which should be more universal.

"Wait until 13" is not much worse than "wait until 8th".

I think I’m missing your point. Would you rather I had not posted the age for people outside the US?

No, I'm saying the website is aimed squarely at those in the U.S.