The NBA has been waiting for Tim Duncan to get old, to slow down, to stop putting up monster lines straight out of his 20-something prime.

If Duncan’s 34-point, 11-rebound, hit-the-game-winner opus in the Spurs’ 104-102 victory over the Los Angeles Clippers showed anything Friday night, it’s that the league can keep waiting.

Those banking on the day Father Time finally catches up to the Spurs’ soon-to-be-37-year-old All-Star can take consolation in a moment late in the second quarter at the AT&T Center, when Duncan stepped to referee Eli Roe and officially became a grumpy old man.

“You could see it, he was in a mood,” Spurs guard Danny Green said. “It’s a mood you don’t want him to be in if you’re the opposing team.”

Incensed at what he felt was a no-call on contact during a putback basket, Duncan barked at Roe, who moments earlier had whistled Spurs coach Gregg Popovich for a technical.

For an instant, Duncan was sure Roe would whistle him next.

“If he did, I deserved it,” Duncan said.

Instead, Duncan heaped his “get off my lawn” frustration onto the Clippers, scoring 10 of the next 12 points for the Spurs over a span of 2:55, helping them claw back from a nine-point deficit.

At game’s end, Duncan supplied more heroics, absorbing a foul from the Clippers’ Willie Green while rolling in a go-ahead 17-footer with 2.2 seconds left.