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Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

According to the TARDIS Data Core there was about two or three years between the appearance of the 9th doctor and his regeneration. From the same source we can estimate that the 10th doctor lived around seven or eight years.  However the doctor claimed to have lived in his 11th incarnation for around three hundred years!  Why would Matt Smith's incarnation of the doctor live so much longer than his 9th or 10th, given Matt Smith and David Tennant portrayed the character for roughly the same number of episodes?
Output:
Why did the 11th doctor live so long compared with his predecessors?