By Daniel Chavkin Both were Pro Bowl caliber players in their careers. View the original article to see embedded media. Two longtime veteran offensive lineman officially retired from the NFL on Friday. First, 13-year center Alex Mack made the news official after Mike Silver reported he was retiring on Thursday. “After 13 seasons and 204 games for 3 teams, I have decided to hang up my cleats,” Mack said on Twitter. “I am so grateful to the game of football and everything it has given me. From the very start it helped shape who I am and taught me life lessons. I started to play football because …