It matters on surroundings, how well you keep yourself. Usually around 100-200 years on average. Course then we got Fyr.

Why don't we just ask the Bethesda team?! They're the ones who created TES world any ways. Here, I'll go send them an email right now.

There's no need, really.

Considering that the Tribunal members were able to live for several hundred years without direct contact with the Heart (House Dagoth began blocking Almsivi's access in 2E 882 and the events of the game occur in 3E 347), it would seem that elves are capable of living much longer than 200 years. I suppose you could argue that they had access to information that the majority of Dunmer didn't from their time spent as gods or that the heart still had some residual effects on them.

The Heart still had a large amount of effect on them. They didn't just loose their powers the second they could no longer get to the Heart - they faded away over a, long, long time. Arguably, the only effect of the "destruction" of the Heart seemed to be that they loose their powers faster. Though I'm a bit tired at the moment, and I don't pay to much attention to what I'm remembering. :dance:

Anyway, faith = power in the TES universe, so as long as people still believed in them, the Tribunal would still have powers. In fact, it seems like the loss of faith in Vivec is what will cause the http://tvtropes.org/pmwiki/pmwiki.php/Main/TheEndOfTheWorldAsWeKnowIt in the end.

don't suppose anybody knows how long the other races live, nord, argonian, kjajjit ect.. :spotted owl:

Shorter than elves, certainly.
If one think of the Khajiit and Argonians simply as beast-men, or as "mannish" variants of their respective animal, they would surely live shorter lives than humans as well. But then again, who knows? Things are a bit more complicated than that. I don't think there is any evidence at all to back anything up considering them.

And humans.. 50-70 years, for the average commoner, who dies of old age? A noble or rich person might live even longer.

The force they bathed in, that came from the Heart made them gods. They would live forever, but without continual bathing every couple of centuries or so, they would become weaker. They still live forever, but over the course of the future they would become so weak they would simply fade into a state of nothingness. Unable to do anything or move out of the nothingness. That's how I interpret their fading away. Though, I took this completely from what happens to Sauron; When the ring was destroyed, he was not killed, because he is an angelic creature, instead he was reduced to a state of such weakness, that he would never be able to return again.

thanks for the input guys