Interesting link RD. However I still think it's likely (or at the very least, possible) that he clung on out of duty rather than preference. From that Wiki page RD supplied:
Quote:
Abdication is considered dangerous by some Catholic thinkers, as it leaves open the possibility that those who dislike the new Pope will claim that there was a conspiracy to oust the old one and that the new Pope might therefore be an Antipope
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The solution should be to set an arbitrary retirement limit: All popes must retire at age X, or when certain medical conditions apply. Then there would be no question of them having been 'ousted'.