The kids are all right. The young Oklahoma City Thunder finished off the San Antonio Spurs 107-99 on Wednesday night and advanced to the NBA finals. Oklahoma City, which moved from Seattle four years ago, was behind by 15 points at halftime to the Spurs, a team with the best record in the league and had won 20 straight games before losing four straight in the conference finals to the Thunder and Kevin Durant, Russell Westbrook, and James Harden. “Those motherf---ers were just better than us,” said Spurs shooting guard Stephen Jackson. The Thunder will face the winner of the Celtics-Heat series, which the Celtics leads 3-2.