For a few years, the NFL had a perfect mix of old and new at quarterback.
A group of Hall of Famers who came into the NFL 20-25 years ago were still playing well in their 30s. A new wave, led by Patrick Mahomes, was making its mark at the same time. In terms of the number of big stars at quarterback, the NFL was arguably never better.
This season marks the end of that era, for the most part.
The older stars started to retire. Peyton Manning was gone after the 2015 season.