Board Thread:Lore Discussion/@comment-101.174.54.47-20130226060747/@comment-7291788-20130326005819

It hasn't been confirmed yet, but I have always thought as an average lifespan:

Altmer: 350

Dunmer: 275

Bosmer: 150

Orsimer: 100

These are merely assumptions, and are my guesses for NATURAL lifespans. So a Mer that is adept in magic could possibly live to be a thousand or more, just as a human mage could live for a few centuries or more. But anything regarding the lifespan of any race has yet to be made official.