I thought bigface was talking about 168. If we're talking straight up joe has the edge cuz of the hopkins win, even though he probably should have lost or got a draw.
Glen Johnson was 39 or 40, or whatever, yeah he was older but I thought that was Froch's best performance up till tonight, as he dominated which isn't an easy task even against an older Johnson. He also dominated Abraham and beat Taylor, both very solid wins at the time and got a decision over Dirrell. That's 5 solid wins at 168 and Joe has 2 solid wins.
edit
forgot jean pascal too. what a resume at 168. Don't really think there is another fighter that has fought such good opponents back to back like this. No tune ups, no stay busy fights, in order:
Jean Pascal
Jermain Taylor
Andre Dirrell
Mikkel Kessler (close loss)
Arthur Abraham
Glen Johnson
Andre Ward (loss)
Lucien Bute