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The only on-screen reason for the discrepancy given is in "The Day of the Doctor" in which the Doctor says he's so old that he can't remember his actual age anymore. This corresponds with writer Steven Moffat's statements on the subject in Doctor Who Magazine and elsewhere, and Russell T Davies wrote a similar line of dialogue for "The End of Time" but it was cut. Exactly when the Doctor forgot his real age has not been revealed, except it had to have been after "Time and the Rani" in which the Seventh Doctor is able to state his exact age.