ARLINGTON, Texas — 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 and the Cowboys agreed to 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.