My first school teacher, Lyudmila Ilyinichna, was 70.
Several fathers and mothers of our class came to the parental meetings with trembling, because they had studied with her once. She once said with a breath: "You teach them, you teach them, and every twenty years a copy of the ear comes back, and again like from a clean board."

It seems funny, but somewhat figured with mathematics this Ludmila Illinois

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What is not so? A 7-year-old boy comes into the first class. After 20 years, this child is 27 years old - and he may already have his 7-year-old child, who goes back to first class.