Jason Witten feels as though the clock is ticking for him to win a Super Bowl alongside Tony Romo. Witten, who turned 30 earlier this month, understands that his career is on the downward slope. "You try not to think about the window," the Cowboys tight end. "But obviously, we're realists. We understand where it's at. I feel great and we're playing great." Witten will enter his 10th season with the Cowboys later this year, while Romo can claim nine seasons and star defender DeMarcus Ware will be up to eight come September. "It's about now," said Witten, who has one playoff game in his career. "I think that's how this whole organization thinks, from owner to head coach to veteran players to rookie players. That's the way this league works."