He will, however, concede that at age 35 he's having a pretty good season.
Nowitzki scored 31 points, including 10 in the fourth quarter, to lead the Mavericks to a 111-104 win over the Houston Rockets on Monday night.
He joked that his big night was simply luck before getting serious and discussing the work he puts in off the court.
"Hopefully I can light it up a couple of more years and then slowly fade away," he said, breaking into a huge smile.
Dallas coach Rick Carlisle isn't surprised at what Nowitzki, who is averaging 21.5 points a game, is doing for his team this season.
"He's the great Dirk Nowitzki," Carlisle said. "He's one of the great players in the history of the game."
Nowitzki missed the first 27 games of last season after knee surgery and the Mavericks missed the playoffs for the first time since the 1999-2000 season. He feels like his game is good now and his injury is behind him, but he wants to do more.
"The driving the ball is what's missing a little now," he said. "I do a lot of one or two dribble and then up, but I want to get back to driving some more to the basket and get to the foul line. I don't think I'm in '11 shape, but compared to the last two years I feel a lot better. The right knee is great and I feel better."
Nowitzki's performance on Monday night gave him 25,629 career points, which moved him past Alex English for 13th place in scoring in NBA history.
Houston cut the lead to six after a 3-pointer by Aaron Brooks with about 3½ minutes left, but Nowitzki knocked down consecutive baskets to push the Mavericks lead to 107-97.
Houston coach Kevin McHale was frustrated that his team was unable to slow Nowitzki down.
"We tried a bunch of different stuff," McHale said. "We tried showing and coming back. We tried staying on there. We tried running at him. Nothing seemed to work."
Dallas started the final period by using a 9-4 run powered by three 3-pointers, including two from Jae Crowder, to push the lead to 95-82.
Dallas outscored Houston 17-10 over the last five minutes of the third quarter to stretch a one-point lead into an 86-78 advantage entering the fourth quarter. Vince Carter scored seven points during that time and Crowder added five.
With the speedy Harden out, the Rockets relied on their inside game and outscored the Mavericks 60-32 in the paint. But the Mavericks had the advantage from 3-point range, where they made 11 to Houston's seven 3-pointers.
"They hit a lot of tough shots tonight, especially in the second half," Howard said. "They shot great the whole game. When a team is shooting that good they are tough to beat."
A 15-1 spurt by Dallas to open that second half erased a seven-point halftime deficit and gave the Mavericks a 65-58 lead with eight minutes left in the third quarter. Nowitzki led the way in that stretch, making seven points including a 3-pointer. The Rockets came out flat to start the third, missing six shots and turning the ball over twice in the first few minutes of the quarter.
The Rockets finally snapped out of their offensive slump after that, using a 10-4 run to get within 69-68 with about 5½ minutes left in the quarter. Parsons made four quick points near the end of it before Howard put an exclamation point on the run with a nifty sideways alley-oop dunk.
Houston led by one point about six minutes before halftime and used an 11-2 run over the next four minutes to extend its lead to 52-42. Howard got things going in that span by scoring six straight points and capped the run with a free throw.
The Rockets led 57-50 at halftime.
Houston announced during the game that guard Patrick Beverley had surgery on Monday to repair a fracture in his right hand and will be out 4-6 weeks. ... Calderon has scored more than 10 points in 18 of his last 20 games. ... Houston has scored at least 60 points in the paint in three of its last four games.