User blog comment:Jack Pistol/Immortal Dovahkiin?/@comment-4772788-20121004211426/@comment-2.217.54.83-20121004212337

Well the body is mortal, and the Dragonborn's physical form is so, however it is uncertian of the soul, but it might just go to either planes of Aetherius or Oblivion, depending on who the Dragonborn in question is loyal too...

Besides, Dragons are basically little Akatoshs, so time doesn't effect them as they do, and they were "dead" and would have stayed that way, if Alduin wasn't around.

Maybe, the dragons do die like everyone else, and there soul is set, I guess to Akatosh's plane, and what Alduin did was bringing back their soul to their physical body on Nirn. Since dragons are closely linked to Akatosh, and Alduin is the first born, he can do that..?