Board Thread:General Discussion/@comment-16100664-20131101015622/@comment-96.231.105.225-20151211213649

http://www.elderscrollsonline.com/en-us/news/post/2013/05/06/ask-us-anything-variety-pack-4

According to the first Q+A on that page, elves live about twice as long as humans and beast races, which implies that humans live as long as beast races.