Quick Question

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Classic Who tells us that the Master runs through all his regenerations;  New Who tells us that the Time Lords resurrected him from the Matrix.  In "The Brain of Morbius", Morbius sends Four back through something like five or six regenerations that are before the One we know during their mind wrestling slap-down match.  Which would mean that Four or maybe Five should have been the Doctor's last regeneration.

Does anyone know of any explanation, whether from classic or new TV series or any other media,  for the fact that the Doctor seems to be past his sell-by date?  (It's for a fic that may never see the light of day, but now I'm curious).