Early 80's database still alive
The oldest tech I'm still using and maintaining is a database app that I wrote in the early 80s, but the data in the database goes all the way back to 1971. In the earliest days it was actually a list updated with a typewriter. (I still had a typewriter until 1989.) I use it about 3 times per week, booting up an old multi-boot machine with a 20-MB DOS partition. I was never able to set up an emulator that could support the FCBs properly, but it's become a concern. It's an ancient ThinkPad, and built like a tank, but how long can it keep going?
Pretty sure that there are very few bugs in the code, but I sometimes edit it to add functionality. I remember adding a rolling window for the Year 2000 problem, and there was a decade tweak around 2011, too. However the main recent modification was a new statistical function that was added about 3 or 5 years back. Major problems because I had forgotten about the internal editor, so when I used an external editor the handling of the CRLFs was quite different.
I mentioned the typewriter, but it also went through a PL/C (dialect of PL/I) version around 1982. At that point the program and data were living on Hollerith cards. And I added a different front end for the Internet around 1997. That version is also still alive, but actually in more feeble condition than the back end running in DOS. I don't even have any admin capability on the server where the PERL/CGI runs, so around 2016 I wound up doing a separate version that can run the PERL locally. Most recent work with the system was actually a new statistical function using JavaScript. But for the last few years I've been thinking about porting the whole thing to Python...
But my actual interest in the story was whether this explains the anomalous location and velocity data. I read about it in a book called "13 Things That Don't Make Sense". Can't find any current references to those anomalies.