Board Thread:Questions and Answers/@comment-24111628-20131015165254/@comment-24252369-20131208092624

I think Sonic Channel is incorrect on that. How about we do some estimations here? I don't think he has an official and updated age, but we could probably get a close enough estimation.

In Sonic Heroes, he was officially 16 (instruction manual). In the same instructions/game, Tails was 8.

Now, I could be wrong here, but I think the last time we were given an official updated age for Tails was in Sonic Riders, in which he was 12. (I never had that game but that was apparently his age.)

-  That's 4 more years so Knuckles must have been 20 in Riders.

So since Riders he has at least been 20 (if my information is correct). He could still be 20 in the recent games.

However, I have a theory that he could also be older in the newer games. This is based on the maturing behavoir of other characters since ''Riders. ''For example in recent games (such as Lost World), Tails has been acting more independant, confident, and is significantly less fearful around his enemies. Because of this, several other fans and I estimate that he is now about 13-14 years old.

So if this is correct, Knuckles could be 21-22 years old at this point.