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They Are 10 Years Old They Met In Preschool They Are In The Same Age In The First 3 Seasons And First Half Of Season 4 They Were In The Third Grade 8 Years Old At The Time In Season 4 Episode 4th Grade AND Onwards They Remained In The 4TH Grade Kyle's Birthday Is May 26th AND Cartman's birthday Is July 1st Kenny'S Birthday Is March 22 Stan'S BIRTHDAY IS OCTOBER 19 In The Same Year They Grew UP Together

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