NFL Offseason - After poring over the data and carefully running our calculations, Football Outsiders is fairly confident we can take one clear conclusion from the 2021 NFL season: Tom Brady is really old.
Yes, it's time once again to go through our snap-weighted age (SWA) data, 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. We have been tracking this since 2006, which allows us to have a fairly good impression of the trends in roster construction and player development we have seen over the past decade and a half.