CINCINNATI -- As a young NFL quarterback, Joe Flacco had a number in mind that signaled what a long and successful career in the league might look like.

But the more games and seasons he banked, he realized he might have set the bar a touch too low.

The number was 15, which he reached three years ago.

The man who entered the league as a clean-shaven prospect out of the University of Delaware now sports a strong patch of gray in the stubble around his chin. Flacco is 40. And on Thursday, he'll be the younger of the two starting quarterbacks.

Aaron Rodgers is 41. And when the two square off in an AFC North contest between Flacco's Cincinnati Bengals and Rodgers' Pittsburgh Steelers on Thursday (8:15 p.m. ET, Prime Video), it'll be somewhat historic. They will be just the second qu

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