Doesn't matter when schools starts, it matters where the age cutoff is. I live in Canada where school starts in September, but you are divided by birth year. Is that not the norm in the Western World?
In the US (well at least my school district in Minneapolis) it oriented around a school calendar i.e. those born September 2000 to August 2001 were all in the same class. People born in September and October were always the oldest in their class. Long story short this graph and the interpretation of this graph is wrong for a number of geographical and cultural inconsistencies.
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