With consideration of the word "biological", do I really need to answer that?
And on reflection on Hairdo's post, how is "powerful sorcerers and members of the nobility with access to expensive potions and enchantments" common practice? It's practically the botox of the TES world.
I wouldn't say that... Botox is relatively common among the upper middle classes here on Earth, whereas in TES, the life extending sorceries and/or potions of the Telvanni and presumably the Psyjics(sp?) are only available to an elite few.
You don't see thousand year old wizards around every corner in Morrowind...there are only a handful of wizards, possibly five or six,with the exceptions of the Tribunal and the Dagoths, who are over 1000 years old. Barenziah and other members of the nobility have extended lives, and this is due to their easy lifestyle and, I suspect, access to potions and other remedies too expensive for the average Dunmer.