I think they do, but what's confusing is that when Sonic The Hedgehog (1991) came out, he was 15. Then in Sonic Heroes he is still 15. So I'm going to believe that Sonic was younger in his first game.
I'm not sure about the others, but I know for a fact that Shadow never ages.
no
Sonic Adventure does.
Ageless, Physically he is 15 (probably), Chronologically he is 50+
NO.
sonic has a lot of friends. But his two closest friends are tails and knuckles.
sonic has a lot of friends. But his two closest friends are tails and knuckles.
No the chao gets sonic hair.
Sonic is Shadow's brother.
Yes, it was created during the "Dark Age of Sonic". Another game in the "Dark Age of Sonic" is the worst Sonic game in the world: Sonic '06.
Yes
Because they think they are just in costumes.
Sonic can turn to dark SuperSonic because he has anger for his friends