As of 2011 he is 20 because 1991 is 20 years ago.
Sonic is about 13 years old on Sonic Underground. On the Sonic Wiki it says Sonic is 17 years old.
In every Sonic game Sonic is about 15 years old.
Not really, Sonic Unleashed was on xbox 360, wii, and some other consoles. An old sonic would be on a cartridge but Sonic Unleashed was on a disc, so it's not that old. 2008 was when it came out, but no Sonic Unleashed is not an old sonic game.
He is 15 years old.
Sonic in all modern games is 15 years old.
17
In 2099, Sonic the Hedgehog will be 108 years old.
a old sonic character in the old tv show and comics
25 maybe.
11
16 or 15.
There are no official Sonic couples.