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 Children are stupid. How does putting them together by age improve the outcome of education? As an adult, do you normally interact only with people your same age? 
 “ putting them together by age improve the outcome of education” 

no, that’s not what I said at all, neither my wife thinks that

“ do you normally interact only with people your same age?”

The key word there is “only”.  No I don’t only interact with people the same age, but mostly yeah. That’s normal.