49ers mailbag: How much longer for Joe Staley?

SpikerIsAwesome‏ @SpikerIsAwesome What's a reasonable amount of time to expect Joe Staley to continue to be the starting LT?

ANSW: Staley will be 34 when the new season begins. He's had some knee and shoulder issues in the past but made a decision -- what turned out to be a really smart decision -- early in his career to play the position at around 300 pounds and to trade mass for quickness. That's probably minimized wear and tear and added to his longevity. Amazingly for a left tackle, he's started 158 of a possible 176 games. As the 2017 season wound to a close, Staley spoke about getting a second wind from the young, energetic 49ers and coaching staff. If the 49ers continue to be…