Yes in sonic heroes, the manual that gave all of the information about the characters said," Sonic the Hedgehog, age:15. Knuckles the echidna, age:16, so yes knuckles is older than sonic
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Sonic is better than knuckles everything shows knuckles is weak knuckles loses every battle sonics better.
In physical strength, yes Knuckles is stronger than Sonic, but due to Sonic's speed the outcome of a battle between them is undecided.
sonic tails knuckles
sonic is stronger than knuckles yes he is stronger than vector
You can only get Knuckles in Sonic 2 if you stack Sonic 2 and Sonic and Knuckles on the Genesis. Otherwise Knuckles cannot be played in the game.