How old is Count Dooku?

GL stated QGJ is in his 60's (far older than Liam Neeson). That would make him in his 70's in AOTC (had he lived). Dooku would have be at least in his eighties (Christopher Lee was 79 at the time) to be old enough to be QGJ's teacher. Also, Obi-Wan does tell Dooku at the end of the conversation, "I don't believe you." In the commentary, GL was stating that Obi-Wan knew that Dooku was lying to him during the whole conversation.

In The Phantom Menace novelisation,there IS a referance near the back of the book(during the final duel between Qui GOn,Obi Wan,and Maul),where it is said Qui Gon was taught lightsaber from an unnamed Jedi Master,who said he (Qui Gon) was the best swordsman he had ever taught. Whether or not,this was supposed to be the Dooku character from Attack of the Clones is debateable.

No, Obi-Wan knows Dooku is lying about his good intentions. Of course Dooku was not lying about being Qui-Gon's teacher! What a pointless lie that would be! Obi-Wan would have KNOWN it anyway.

I can really say about Dooku being (one of) Qui-Gon's teachers is . . . it remains to be seen. Dooku made a claim, now where's some actual proof that he was?