She is now 18 years old. Hope that answers your question!
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SEGA officialy rejected storyline of game Sonic the hedgehog 2006.Also they accepted that Rouge likes Knuckles.
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.
She is about 20
Shadow the Hedgehog is the equivalent of sonic. Rouge the bat is the equivalent of tails. and Omega is the equivalent of knuckles the echidna.