I would say Gretzky had the best career of any athlete in team sports. But Brady's is the most impressive considering football is the most team driven of the team sports and he proved last year that he's the biggest needle mover in the game's history. to be fair, you could have placed just about any of the names you think of as all time great QBs into that situation and they could have pulled it off. it's still impressive as hell that it actually happened, though. Kind of an exclamation point on his career. At age 43 though? Pretty much every all time great QB was retired at age 43. Dude threw for 4600 yards and 40 TD and win a Super Bowl at an age virtually all QB are a shell of their peak selves.