Mephiles in 06 was in the Scepter of Darkness for approximately 10 years, and right now he is about 17 or so.
Shadow is over 50
Sonic is maybe in his 20's.
Silver would be in his 20's most likely to.
And so Mephiles is therefore the youngest HEDGEHOG or..lookalike, since Silver was older than him in the game.
And maybe about 2011? Maybe 2010? Dunno. It's been here for a while...