since they were in kidergraden
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Chris is 12 years old
about 12 years old in the sonic x shows or series
Sonic is 19 years old and his birthday is June 23, 1991.
As Sonic Underground was made during the time of 2D Sonic games, his age was probably around 9 as that was his age at the time within the games.On Sonic wiki it says that he is 17 years old.
Fiona Fox is 16 years old in Sonic the Hedgehog.