I hear you on the different eras. I can't stand all the rules nowadays meant to protect the QB.
But that's not Favre's fault... all Favre is able to do is play in his era and suit up every single week, no matter what his ailments are, and he's done just that.
He plays no matter what. Maybe I'm being closed-minded, but I just don't see how you can get "tougher" than that.
Based on what I've seen from Favre, I see no reason to believe he couldn't have played and showed similar grit/toughness in previous eras when the QB wasn't as protected.
As for being a "typical old guy", trust me, I'll be one of those if/when I get to your age.
At 24, I've managed to already be waaaaay out of touch with the "young generation", and every chance I get I let them know how much better things were in the '90s.