One word:
Barenziah.
Not to say you are WRONG, just to say that straight-up saying 120-130 and then leaving it at that is a bit incomplete. I would say anything from 100 - 800 years is plausible for a Dunmer to live, unless they happen to be a certain magician by the name of Fyr, or should you happen to be the Nerevarine. 100 years for someone like an ashlander, 800 for a powerful wizard or an aristocrat.
There is some evidence to support that arcane knowledge extends the lifespan.
Janus Hassildor's long life was accredited to that, he was happy to let the people of Skingrad believe that, to hide he was a vampire.
There is Divayth and the whole Telvanni council for that matter. (Although it doesnt always seem to be succesful as in the case of Therana.)
If magical practice and knowledge can extend the life, surely people of wealth and influence can afford good healers and other aids to keep them fit beyond their natural span, as I believe is the case with Barenziah.
In short, the average peasant Dunmer may live 100-120 years, lifetime of toiling and all that, but an upper class lady of leisure has less environmental stress firstly and can afford the best care secondly.