In his autopsy of the Falcons' season an Atlanta writer noted recently that the Falcons O-line decline was anticipated this season by application of former ESPN writer John Clayton's "Rule of 150"

I had never heard of that "rule" but it goes as follows

If a team lets its starting offensive line exceed the total age of 150 years for five starters, the clock is ticking on its remaining success.

http://www.espn.com/nfl/story/_/id/8...g-fits-coaches

Assuming Gilbert should still be included as a starter, the ages of the Steelers OL starters are AV (30), DeCastro (28), Foster (32), Pouncey (29) and Gilbert (30) - a total of 149

https://www.steelers.com/team/players-roster/

I have assumed Foster was gone after this season but taking this factor into account leads me to guess with his extended absences over the past 2 years Gilbert probably will be released after this season as well as the Steelers move to avoid getting old all at once across the OL

Just another benchmark on the clock ticking more loudly for the current group of starters