What is the oldest programming language still being used?

[Baron_Greenback]

You can still compile ALGOL 60 on Unisys MCP mainframe and mid-range machines.

[Voyager]

@friedo

Yeah, but what assemblers and machine languages are we talking about? Nobody’s yanking vacuum tubes on ENIACs any more, and I seriously doubt anyone is writing new code in even PDP-11 assembler. People are writing code for assemblers on more modern architectures like x86, PPC, Alpha and ARM, but you can’t compare those languages as belonging to the same family as assemblers from the 1960s and 1970s; they are completely different.

And 1950’s. My grad adviser was a student of von Neumann’s at Princeton, and wrote an assembler for the IAS machine. I suspect that was the world’s first. This was around 1951 or 1952. Not in use anymore, of course.