Can't get older than this one:

https://info.cern.ch/hypertext/WWW/TheProject.html

I give you Warren Buffets company website.
https://www.berkshirehathaway.com/

The domain was purchased in 1996 It looks like they never updated the layout since.

Everything is possible at Zombocom, est. 1999

Everybody get up, it's time to slam now! We got a real jam goin' down now!

Welcome to the Space Jam

GameFAQs.com launched November 5, 1995, although it didn't have that name or URL until 1996.

Webtender - An On-Line Bartender.

The Webtender web site including, but not limited to the collection of recipes, web links and drinking games, as well as graphics and layout, is Copyright © 1995-2025, The Webtender/Pål Løberg unless stated otherwise.

https://www.webtender.com/info/c.html

Not only is it 30 years old, but it has searching built-in since at least 1997, if not the whole time. This puts it in a very special class: first-generation server-side web applications. Looks like it's still rocking cgi-bin.

https://info.cern.ch/

Honourable mention:
https://homestarrunner.com/

No idea why this is the 3rd time this has come up now, but I just learned this year that an anti "barney the dinosaur" webpage is among the oldest still active ones, where you can shoot and stab him.

Hate for children's media for being... for children has really come a long way. Now we hate them for legitimate reasons, like peppa pig for being bloody monarchists and Bluey for being Australian.

https://netbsd.org/ registered March 1994

https://perdu.com/ registered June 1996.

Peter's The Evil Overlord List is a treasure of the long before times: http://eviloverlord.com/

Copyright 1997

"The Top 100 Things I'd Do If I Ever Became An Evil Overlord"

Mandatory reading for anyone trying to be an Evil Overlord.

Does SDF count? It's been going since 1987. Obviously the Lemmy instance is newer, and it's stretching the definition of website a bit.

https://zorotl.com/

The official page for the alien in the "I'm Blue" music video.

Lost Souls Domain

It's surely one of the first sites that I know and use, and it's still alive. I think it's from the 90s. (Looked it up again, their earliest visitor count starts at 1997)

Later we have Metal Archives, but I think Lost Souls Domain was the first website where you look for Metal music informations.

http://thebear.org/

This still exists. It's Grateful Dead related.

I don't know how to find any date info on it though, sorry.

theguyintheglass.com (about the poem) was last updated on 1998-10-03 and created on 1997-12-25 according to the footer.

The oldest one I regularly use is this one: https://web.archive.org/web/19961108115333/http://www.kela.fi/

It's the Finnish state organ for giving people their welfare benefits and operating the national health insurance system. So, if you get a child, you get an amount of money per month from Kela for having a child. (Because they want the population to grow).
Or, if you end up unemployed for a longer time, it's Kela that will pay your unemployment benefits.
Of if you break your leg, it's Kela that pays for your hospital care. I don't know how many forms I've already filled on their website :D

But yeah, the site's been around for a while now.

I recently had to dig deeper into Regex than I thought one could dig into Regex and found this website that claims it’s from 2003: https://www.regular-expressions.info/

https://milk.com/

1994, and still quite active

My MySpace page. Has ALL the animated dancing banana GIFs you could ever want.

Sluggy Freelance and Schlock Mercenary have both been around a while and both have (or had, when I still had time to read webcomics) stellar reputations for reliability.

I was going to mention User Friendly, but sadly that appears to be down. I think it was last time I checked, too, so I'm guessing it's a lost cause.

I have a website that has been up since 1995. I haven't updated in 20 years or so.

Yahoo.com always comes to mind for these.

March 1994