Board Thread:Lore Discussion/@comment-13436964-20130726062712/@comment-25047024-20140219172420

92.96.220.228 wrote: The Dragonborn is immortal by default, because of having a soul of an immortal dragon? (?)

Miirak didn't die because Herma-Mora protected him in his realm of Oblivion.

Tiber Septim/Talos ascended to the sky and became a Divine.

St. Alessia wasn't much of a Dragonborn, more like a Saint.

You can also become an ageless Vampire in Morrowind and Dawnguard. Saint Alessia was Dragonborn, but not the "normal", soul-absorbing kind of Dragonborn. Her power was to imagine freedom.