Tony Romo has a chance to start for the Dallas Cowboys longer than Roger Staubach or Troy Aikman. The question is whether he will ever match their Super Bowl pedigrees.

Romo signed a six-year contract extension worth $108 million Friday, with about half of that guaranteed to make him the highest-paid player in franchise history.

The agreement, reported on the team’s website, will lower the quarterback’s salary-cap number for 2013 by about $5 million, giving the team more room to sign free agents and draft picks.

Romo, who turns 33 next month and was entering the final year of his contract, gets $55 million guaranteed.

Super Bowl winner Joe Flacco got $52 million guaranteed in the six-year, $120.6 million contract he signed with Baltimore earlier this month.

“I think it’s just exciting more than anything that you know you’re going to be here the rest of my career,” Romo said in a video on the team’s website that showed owner Jerry Jones exchanging high-fives with Romo’s nearly 1-year-old son. “We’re a team on the rise and I think it’s going to show here going forward.”

Romo could be with Dallas through 2019, giving him a chance to be the starter longer than the 11 seasons of Aikman and seven of Staubach, who was a part-time starter his first four years with the Cowboys.

Aikman and Staubach won five Super Bowls between them, while Romo has just one playoff win in six full seasons as the starter. He had a gut-wrenching playoff loss the year he took over midseason in 2006, flubbing the hold after driving the Cowboys into position for the go-ahead field goal in the final minutes.

Romo is the franchise leader in touchdown passes and the single-season leader in touchdowns, passing yards, completions and attempts. He had a career-high 4,903 passing yards in 2012 but matched his highest interception total at 19 and had his lowest quarterback rating at 90.5 rating.

Barney sues for age bias

Former Detroit Lions great and hall of famer Lem Barney filed a discrimination lawsuit Friday against a Detroit health system, alleging he was fired because of his age.

Barney, a defensive back with the Lions in the 1960s and ‘70s, alleges that his supervisor at Detroit Medical Center once asked him, “why don’t you just retire already?” after noting he was in his 60s and made a lot of money playing professional football. He also said he ran afoul of a supervisor by signing too many autographs for fans.

Detroit Medical Center officials declined comment.

Barney, 67, began working as the medical center’s director of physician relations and replacement in 2006. He was fired in February, just weeks after returning to work after back surgery, following two demotions. At the time, his pay had been cut from $80,000 per year to $30,000, and he was reduced to handing out parking passes to patients’ families, the lawsuit alleges.

The lawsuit is seeking $290,000 in damages.

Davis stays with Redskins

Tight end Fred Davis re-signed with the Washington Redskins. A person familiar with the agreement says Davis received a one-year contract after exploring options with the Buffalo Bills and New York Jets. The source was not named because the team did not announce terms of the deal.

Davis might have been one of the most coveted tight ends on the free agent market if he were healthy, but he’s recovering from a torn left Achilles suffered in a loss to the New York Giants in October.

He had 24 catches for 325 yards in seven games last year. The 2008 second-round pick has 155 receptions for 1,973 yards and 12 touchdowns in five Redskins seasons.

Around the league

The Chicago Bears re-signed backup quarterback Josh McCown, agreeing to a one-year contract. McCown, 33, finished the last two years with the Bears, joining them each season in November after starter Jay Cutler was injured. The Bears and former New York Jets guard Matt Slauson also agreed to a one-year contract. Slauson started 48 out of 51 games with the Jets. ... Philadelphia Eagles fullback Stanley Havili was shipped to the Indianapolis Colts for journeyman defensive end Clifton Geathers. ... Free-agent linebacker Victor Butler signed a two-year contract with New Orleans. ... Former Eagles defensive end Darryl Tapp signed a one-year contract with the Redskins. In three seasons with the Eagles, he had six sacks in 39 games. ...The Seattle Seahawks reached an agreement to sign defensive lineman Tony McDaniel from the Miami Dolphins.

University not interested

Northern Arizona University rescinded its offers for the Arizona Cardinals to conduct training camp on the Flagstaff campus. The Arizona Daily Sun reported that NAU President John Haeger says the school isn’t interested in a short-term deal. The Cardinals and NAU officials reportedly were discussing both a one-year deal and a three-year deal before the university ended talks.