Well, Dooku's meant to be as physically fit as men half his age (so like 40), and to my knowledge that was in relation to physical fitness, not the Force. Add in that he's trained in various unarmed martial arts and is just a far better fighter than Ahsoka I can see him taking the first round, providing all of that holds up.
And he slaughters round 2.
Nah, it refers directly to his physical shape, health, senses and says his age isn't an issue. I mean it even says that even when accounting for the Force the Dooku's age isn't a handicap.
Physically, the Count's age was rarely a handicap. Deft as he had become with the Force -- unimaginably more subtle than the boy who had watched water-skeeters in the Jedi gardens all those years ago-he wore his eighty-three standard years better than most humans half his age. He was still in superb physical shape, senses keen, health undiminished by even the memory of a cold.