Age specific questions from about 8 years to about 11 years. Younger: primary-schooler. Older: pre-teen.
This age specific tag covers questions about kids after they have been in school for a while, until they start to turn into teens, so say from about 8 years of age to about 11 years.
As with any age specific tag, the edges are fuzzy between this and the previous and following tags: primary-schooler and pre-teen.
Rule of thumb: once they move up to the second round of schooling then you're ready to move up to middle-schooler, until they start to turn into teenagers.