I've finished dawnguard quest from both vamp and dawnguard side which pre much get the same ending nnyway ^.^ but while im playing through the dlc as a werewolf. Throughout the story line the vampires people like Harkon and Valerica(or whatever the hello her name is ) treats me as if Im some MORTAL guy.... I mean i know that they're vampires so they'll live forever unless i put an arrow through their face. But Isnt that the same with werewolf too?? I mean arent both vampires AND werewolf supposed to have that longevity?? living forever unless someone kills you?? or something like that?

It is not known whether or not werewolves live longer than most humans. They age, yes, but they might have extended lifespans like Tharsten-Heart Fang who was a werewolf who lived for generations.

So werewolf just have longer life span than human but they'll still die eventually? while vampires live foreverrrrrrr??

They still get to hunt for eternity in the Hunting Grounds, living forever in the afterlife. Vampires are immortal in a sense that they do not age, which means they all have a violent end if they are to truly die.

Oh ok. Thx for clearin that up