Oh I am afraid you didn't understand me. Let me clear this out.
Talos (Tiber Septim, Ysmir) was from Skyrim, I'm sure. Was he Nord? Who knows, possible. But I haven't said that he was Breton.
I just wanted to make conclusion. As both Bretons and Nords are humans and the oldest was 108 years old.
Then I asked why Bretons cant prolong their life as a mortal being as they also have "a magic in their veins".
I understand that my post was pretty unclear, hope it's good now.
well, Divayth Fyr is just plain uber. Simple as that. Bretons could extend their lives, but their kinda at a disadvantage in that they probably have a humie life span, while Divayth would have been able to develop his earliest attempts at life-extending magics over the course of several hundred years if he kept himself in good health. Any breton simply wouldn't have as much time in their natural life span to do the work.
edit: but really, any race could extend their life through magic, they don't have to be elves.
Also, what gallow said, Divayth's life span is super unnatural for a dunmer.