[Older than the Master is definitely right. Plus or minus a few variations in the timeline, but older nonetheless. Even if he hasn't much thought about the Master of late. (For good reason, mind.)
Still, it's the comment about being a Time Lord that stirs him into action and he's just about to offer a half-sarcastic comment about how of course he is, when the Doctor gets around to the part about not recognizing him.]
You can't tell.
[It's offered in just about the flattest and least impressed deadpan, as if his identity is something that he thinks should be obvious. Enough so that he doesn't immediately offer any hints as to who he is, though he might yet if it proves to be absolutely necessary.]
no subject
Still, it's the comment about being a Time Lord that stirs him into action and he's just about to offer a half-sarcastic comment about how of course he is, when the Doctor gets around to the part about not recognizing him.]
You can't tell.
[It's offered in just about the flattest and least impressed deadpan, as if his identity is something that he thinks should be obvious. Enough so that he doesn't immediately offer any hints as to who he is, though he might yet if it proves to be absolutely necessary.]