If LeBron James needed any more motivation to win in this year's playoffs ... he certainly got it on Wednesday night from Dillon Brooks, who blasted the Lakers star as "old" after beating him.
The Grizzlies wing -- known as one of the biggest agitators in the NBA -- made the eyebrow-raising comments following Memphis' 103-93 Game 2 victory.
Brooks had gotten in LeBron's face repeatedly during the contest in Tennessee ... and when he was asked if he had considered that it could potentially set James off -- Brooks unloaded.