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Jeremie is the youngest. he is 12. Odd and Ulrich are 13. Yumi is the eldest, 14 years old. I don't know for William but i guess he's 14 too cause he looks obviously older. i think Aelita is 19 because she said she got on lyoko when she was 8, and she said shes been there 10 years. Also in one of the episodes they celebrate her birthday.

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14y ago

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