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There was a consistent aging of the Doctor in the classic series from the time he first mentioned his age, in "The Tomb of the Cybermen", to the last, in "Autumn Mist" (BBC Eighth Doctor Adventures novel). It was in the first series (2005) of the New Series, when he said he was "900", that long-term fans were confused. Thus, the first Doctor who stated an age that didn't match up with what was known before was the Ninth Doctor, but it is unclear when or how exactly the Doctor first became confused.