From 1999, according to the page footer:
> © 1999 url shorteners are so yesterday try this amazing super long url expander . All rights reserved.
I tried to confirm that, but the Internet Archive and Wayback Machine are still down.
The same here. If you ask me, the first appeared a few years later, but human memories are erroneous.
It's a Show HN. People typically don't post Show HNs for what they made 25 years ago.
so no, it can't be more than four days old.