He is 15 years old but no one no knows now after Sonic Generations came out.
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She is now 18 years old. Hope that answers your question!
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.
The anagram of sonic the hedgehog "sonic the hedgehog."
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