How old are 4th graders in China?

So, how old are fourth graders in China, anyway? My friend's daughter just started fourth grade over there, and she's nine! Nine! Can you believe it? It feels like only yesterday I was bouncing her on my knee, she was such a tiny thing. Seriously, where does the time go?!

Here in [Your Country/State], kids start school a little later, I think. Nine or ten seems to be the sweet spot for fourth grade, though. But it's a big year, I heard. My cousin, he was always a bit of a troublemaker, remember?, had a really tough time adjusting to the increased workload in fourth grade. Suddenly, it's not just coloring anymore, right? They're hitting them with fractions and all sorts of complicated stuff. Makes me feel old, thinking about it, haha! All those long division problems... I'm pretty sure I still have nightmares about them.

I read somewhere – I think it was an article about international education, or maybe it was just a random Facebook post, honestly, I can't quite remember – that the age range for fourth graders globally is pretty broad. It really depends on the country's education system, you know? But yeah, nine or ten? That sounds about right for China, based on what my friend told me. It's crazy to think about all the different experiences kids have around the world, even at such a young age.