Jet the Hawk is 14 years old.
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Fiona Fox is 16 years old in Sonic the Hedgehog.
To me, I think he started depending on your question is in 1991,where the old cartoon "Sonic The Hedgehog" started.
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He is 15 years old but no one no knows now after Sonic Generations came out.
Sonic the hedgehog used to be 10 years old but they changed his age to either 15 or 16.