Board Thread:Skyrim/@comment-11474177-20130808012214/@comment-27219956-20151213231946

I was thinking that the dragon soul that the Dragonborn has could be setting the Dragonborn back into a previous point of time (A.K.A your last save), thus technically making him 'immortal'. Now, if the Dragonborn kept his memory from before his 'death', he could remember how he died, and possibly prevent or avoid it.

However, Miraak gets killed by the Last Dragonborn (your character) and doesn't 'respawn', and this is because the Last Dragonborn absorbs Miraak's dragon soul before it can send Miraak back in time.

Also, I think that enough dragon souls must prevent aging, because not only was Miraak (who had atleast 10 souls) living from the Merethic Era to the Fourth Era, but also because the Last Dragonborn doesn't age during the game. The reason why people like Alessia the Slave Queen and Tiber Septim kept aging is because they didn't have enough souls to keep them going.