What is the most useful way to measure the average age of an N.F.L. team? Calculating the average age of a 53-man roster takes you only so far because the age of a team’s starters is much more relevant than the age of a team’s reserves. The average age of a team’s starting lineup isn’t perfect, either. The age of the quarterback and key offensive and defensive players should count for more than the age of a rotational starter. The best way to calculate a team’s functional average age is to place greater weight on the age of a team’s most relevant players.
