Does the lore ever state how long Vampires live in TES? Are they immortal, or do they die of what could be considered "Old age" for them?

Vampire are ageless.

Alright, just had to be sure. And thanks for the message http://www.gamesas.com/user/626531-werewolfvampire/, I thought I read that somewhere but I wasn't certain if it was for TES or not.

Vamps can't die of age technically their undead.