Exerpt
In 1985, Joe Theismann was 36 years old and having his worst season in the NFL, with eight touchdown passes and 16 interceptions. The Washington Redskins were hanging around .500, on the way to missing the playoffs for the first time in four years.
Coach Joe Gibbs refused to take Theismann out. When the quarterback change finally took place, it was by gruesome means. Lawrence Taylor broke Theismann's leg in the 11th game of the season, ending Theismann's career and forcing Gibbs to turn to 24-year-old backup Jay Schroeder.
Two years ago, Mark Brunell was having the worst season of his career at age 34, unable to throw for even 100 yards in most of his starts. Gibbs stuck by the veteran as long as he could before benching him in the ninth game for Patrick Ramsey.
http://www.sportsline.com/nfl/story/9676504