The ages of some of the main characters:
Sonic-15 Knuckles-16 Tails-8 Amy-12 Cream-6 Shadow-50(wow! hes OLD!)
Blaze-14 Silver-14 Sonia-13 Manic-(i think about 17) Rouge-17 Tikal-14
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Fiona Fox is 16 years old in Sonic the Hedgehog.
Fang the sniper aka Nack the weasel is a character in the the old Sonic the hedgehog series. He fights with guns and jumps like Sonic.
To me, I think he started depending on your question is in 1991,where the old cartoon "Sonic The Hedgehog" started.
Not counting the Chao, the youngest character would probably be Amy, who is 6 years old. One more edit on this will have to be a report.
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