"You are old, Coach William", the young writer said,
"And your players are all going gray;
And yet you keep winning and beating the spread --
Do you think that will all end someday?"
"In my youth," said the coach, "I did what I can,
From the above-board to the quite shady;
But as our players age, I'll need a new plan;
It's time to get rid of Tom Brady."
The New England Patriots were old in 2019.
Football Outsiders has been tracking snap-weighted age since 2006 -- calculating a team's age not by just averaging the ages of the players on the roster, but by weighting the age of each player by the number of snaps he played in the regular season.