Documented, still online (Score 1)

Well, I don't know about the oldest ever, but Netsurfer Digest has a web page unchanged and online since June 3, 1994. It's the first beta issue of the e-zine:

http://www.netsurf.com/nsd/v00/nsd.94.06.03.html

Can anybody come up with an older continuously served web page? Netsurfer would probably like to write about it <g>

Incidentally some great 1994 stories in that one, echoes of the pre/proto-Net online world. For example a censorship crackdown on Italian BBSes and online advertising flamed to a crisp on USENET. Ahhh, the more things change, the more they stay the same!