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In "Time and the Rani" the newly regenerated Seventh Doctor says that he is 953 years old.

In the BBC EDA "Vampire Science" (novel) the Eighth Doctor says that he was 1009 when he regenerated in the TV movie, simply titled "Doctor Who".

The only on-screen reason given for the fact the Ninth Doctor later reduced his age to 900 is given in "The Day of the Doctor" when the Eleventh Doctor indicates that he is so old, he's forgotten how old he is. This supports statements by both Russell T Davies and Steven Moffat addressing the apparent contradiction.