Sure, it says that Dooku replenished himself after he took out Kenobi, but his reserves got demolished throughout the fight:
'The shining blue lightsaber whirled and spat and every overhand chop crashed against Dooku's defense with the unstoppable power of a meteor strike; the Sith Lord spent lavishly of his reserve of the Force merely to meet these attacks without being cut in half, and Skywalker-Skywalker was getting stronger.
Each parry cost Dooku more power than he'd used to throw Kenobi across the room; each block aged him a decade.
He decided he'd best revise his strategy once again.
He no longer even tried to strike back. Force exhaustion began to close down his perceptions, drawing his consciousness back down to his physical form, trapping him within his own skull until he could barely even feel the contours of the room around him; he dimly sensed stairs at his back, stairs that led up to the entrance balcony. He retreated up them, using the higher ground for leverage, but Skywalker just kept on coming, tirelessly ferocious.'
'He was barely able to summon a last surge of dark power before what would have been a disabling impact. The Force cradled him, cushioning his fall and setting him on his feet.'
After all that it would be absurd to act as if Anakin beat a Dooku who was anywhere near his best or even half of it. Unless he somehow recovers all that energy in a 3 second rest.
Originally posted by Nephthys
Your quote simply says that the 'weight of his years dropped away.' Not that he completely recovered. It would be retarded to think that he recovered from the above in such a way.
I don't see how:
ROTS
Skywalker leapt for him again, and this time Dooku met the boy's charge easily. They stood nearly toe-to-toe, blades flashing faster than the eye could see, but Skywalker had lost his edge: a simple taunt was all that had been required to shift the focus of his attention from winning the fight to controlling his own emotions. The angrier he got, the more afraid he became, and the fear fed his anger in turn; like the proverbial Corellian multipede, now that he had started thinking about what he was doing, he could no longer walk.Dooku allowed himself to relax; he felt that spirit of playfulness coming over him again as he and Skywalker spun 'round each other in their lethal dance. Whatever fun was to be had, he should enjoy while he could.
Then Sidious, for some reason, decided to intervene.
Immediately after replenishing himself, he is comfortable enough to beckon Anakin to continue his charge.
Though for what it's worth, the script's depiction of events is different: Obi-Wan and Dooku get tired as the fight progresses whereas Anakin grows stronger. It says that after Dooku taunts Anakin, Anakin attacks with "new ferociousness" and though the battle "is intense", Anakin disarms Dooku in one last "energized charge." It seems more accurate than the novel's account, too.