User blog comment:Jimeee/Bethesda Games Studios: "Moving to our next adventure"/@comment-76.16.151.231-20130425011857/@comment-16219425-20130425203846

The Dwemer aren't extinct...they just suddenly 'vanished' around the First Era/Second Era. No one knows what happened...except the Dwarves themselves.

The Falmer (Snow Elves) aren't extinct, because Knigh-Paladin Bossman is still alive (which means he's one of the oldest mortals in existence).