Does using a recent version of something that's been updated for a while count? Adobe Illustrator's first release was March 1987, making it 32 years old this month; I use it pretty much daily. I'm currently using last year's version.
Warning: nerd at work. The question may be ambiguous. To highlight: compare "what's the oldest software you still use today" to "what's the oldest software you use today". The first one refers to software you have been using over a longish(?) period and the second to software that may be old that you are using even though you may have only begun using it. I hope my pedantry (pedanticism?) isn't too inane...
I hope my pedantry (pedanticism?) isn't too inane...
Or, you surreptitiously hope it's much too inane, much as people do with puns. What should we call those who secretly love pedantry? "Pedantophiles?" Oh what a difference one syllable makes!
Not sure if that's cheating - most of the suggestions on this page go from the original version of something. A kind of 'Ship of Theseus' problem - there's no natural or obvious definition of 'what counts as still the same thing' (except 'all parts exactly the same', I guess).
Wikipedia says grep is from 1974.
Cat, chmod, chown, comp, cp, date, df, du, ed, find, ln, ls, mailx, mkdir, mv, nm, od, pr, rm, rmdir, sort, strip, tty, unlink, wc, who, and write are from Version 1 Unix - Nov 1971!
The page for ed says: "It was one of the first parts of the Unix operating system that was developed, in August 1969."
My father, a chemistry professor, still uses PegasusMail which has been around since approx the year 1990. He is also good at handling his mail through `pine` program over a terminal.
I still use Reaktor by Native Instruments. It's been on the market since like '96 or something and it's ugly and clumsy as hell but it still sounds way better than anything else...
https://en.wikipedia.org/wiki/Tar_(computing)
Although mine was written in 2010.
Edit: Actually it's probably telnet which I use to get into lab equipment. First version is from 1973. The version I run was written in 1993.