What is the oldest code you wrote that is still running in production?

Question

I'm curious to hear from both folks that have been in the industry for decades and those that are still relatively new: To the best of your knowledge what is the oldest bit of code that you've written that you know (or believe) is still running in production?For myself: I wrote a data management system for nuclear reactor steam generator inspection/repair in VB6 from 1997-1999. It has been running in production since then.

rurban · Accepted Answer

1994, lot of internal code for a then Austrian ISP, since bought by a competitor, but the code is still running I hear. (Voip regex routing engine for asterisk in C, a webmail in PHP, dns, lot of Perl stuff)

QuadrupleA · Answer

Not a professional project, but an academic phrase generator I wrote to poke fun at a teacher in 1996-ish that my teenage friends and I deemed pretentious is still up and running:
https://phrasegenerator.com/academic
Only the source words remain though - code was originally Cold Fusion I think, generated on the server; then ASP.NET & XML when everything cool had to be XML. Currently python / flask with the phrases generated in js.