Is this just a surge or is it possible that he's going to stay at least close to his current level? It doesn't seem possible at his age, but he said something after the Rockets game that got me thinking. Something to the effect of (paraphrasing): I'm not worried about the next game or pacing myself, I'm just going to play as hard as I can.
I think he's sick of hearing about how old he is, not so much from outsiders, but from Pop. Pop doesn't say it, so much as he does perpetuate it, with the way he manages his minutes and constantly talks about the need to get him games off. That performance against the Hornets, at the end of 4-in-5, was a statement game to Pop. I think he'd also like to show a lot of the younger guys on the team that he's not just a high end role player and that he is still at least a star caliber player.