Peyton Manning is the only five-time MVP in NFL history, one of the faces of the league and, at 39, the oldest starting quarterback to lead a team to the Super Bowl.
Slowed by age and injury, he is no longer the record-breaking passer he once was. Most folks figure Manning's fourth Super Sunday appearance will be his last game as a pro.
Cam Newton is at the opposite end of his career, just 26, making his debut in the big game. He also is expected to earn MVP honors for the first time, part of a new breed of dual-threat QBs as good at running as they are at throwing.
For the next two weeks, until Manning's AFC champion Denver Broncos (14-4) play Newton's NFC champion...