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Unless a future episode specifies the Doctor's age, it cannot be calculated at the present moment because it is not known how long the Doctor was on Trenzalore, and his "starting point" age is not certain either, as confirmed in "The Day of the Doctor" when the Doctor says he can't remember his actual age. That said, in an interview in December 2013, 55-year-old Peter Capaldi stated that he was "1,995 years too young" to play the part; whether this suggests that an exact current number might actually be stated an upcoming episode (it sounds like a rather exact figure to pull out of the air) remains to be seen.