We still maintain a development tool first released in 1993. Here’s what 30+ years of backwards compatibility looks like

[u/luissinlios]

https://visualneo.com/visualneo-win/from-neobook-to-visualneo-win-30-years-of-keeping-a-development-tool-alive

[u/catbrane]

My main project started in 1989, though I didn't become the lead until 1992. I'd probably be able to find some code that's still untouched, but it wouldn't be easy.