When two years is an NFL eternity

NFC West teams have four new offensive and defensive coordinators this offseason.

That includes two in Arizona and one apiece in St. Louis and Seattle.

NFL Coordinator Longevity

The staff continuity in San Francisco -- both coordinators in place for each of the past two seasons -- would not seem to be particularly impressive. That kind of continuity on both sides of the ball is the exception, however.

San Francisco, Houston, Washington, Detroit, Cincinnati and the New York Giants are the only teams with both offensive and defensive coordinators in place since 2011 or earlier.

NFL teams have 13 new offensive coordinators and 12 new defensive coordinators. Twenty-three offensive coordinators and 22 defensive coordinators have been in their current roles since 2012 or later.

Five offensive coordinators and six defensive coordinators have been in place for the past three seasons or longer. Pittsburgh Steelers defensive coordinator Dick LeBeau (nine years) and New York Giants offensive coordinator Kevin Gilbride (six years) are the longest-tenured coordinators.

The 49ers' Greg Roman and Vic Fangio will be returning for their third season together as San Francisco's coordinators. Bravo.