This might not necessarily be about speed of brain development but a range of other factors. For examples the differences between a person at 7a and 4b could be due to:
-the genes they have inherited which allow them to remember things quicker
-their parents education, the parents of the child with a 7a maybe better able to help the child with homework etc so they progress faster
-the school that they child goes too
-even the diet (food and drink) can contribute to how well a child pays attention in class
– how much sleep the child gets
-illnesses
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