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And it still supports everything, including Windows 3.1
TYVM
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We're porting a legacy code base and in the process caught a bug no one found in 15+ years. The new fixed code caused the output to change by some, which meant the output from the legacy and new app did not match in some cases. Customers did not like the change and they want the new code to work exactly as the legacy and we ended up re-introducing the bug. I wonder, if the customer wants it that way, is it a bug?
p.s. This was some sort of heavy mathematical calculation which spits out some value.
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I sometimes see code from 1998, 1999... If it has never been changed there is a reason  also some of the equipment we have to communicate with has the same age.
Geek code v 3.12 {
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- r++>+++ y+++*
Weapons extension: ma- k++ F+2 X
}
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It is a COBOL application (an older - by 4 generations - version of our current), that 3 of our customers refuse to update...It works, but lacks all the new features we have today...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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Depending on if it is the physical code, algorithm implemented with it or the executable generates different responses. I have subroutines that the algorithm is older than I am. The oldest executable was compiled using an old Lahey Fortran compiler in the 80s. My job is unique in that early computers were pretty much invented to solve this type of problem (well ballistic trajectories anyway). Yay for astrodynamics/orbital mechanics!
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I think it comes down to a couple of things for longevity: has the business changed enough to warrant new code to replace old, and has the code been well-written? If I have an old truck that still works and I still haul the same stuff around now as I did 20 years ago, I don't need to replace it with a new truck or even a different type of vehicle, now do I?
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Do you still use card punch to program? 
New version: WinHeist Version 2.1.1 new web site.
I know the voices in my head are not real but damn they come up with some good ideas!
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I use the similarly antiquated TSO together with TextPad on my PC.
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Not sure what is meant by this use of Swift, but when I first started in the world, the company I worked for had this backend mainframe called SWIFT.
I wonder if they're still using it. I wouldn't be surprised. Built in the late 60s, I think.
There was an effort to replace all three layers of our systems in the late 90s. Many consultants brought in at huge expense. I was asked to join that project in the second wave, saw what a train wreck it was, and bailed out.
Last I heard, executives fired, wailing and tears, etc, but I don't recall if I heard whether the project itself ended up going anywhere.
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which is 7 years
"Program testing can be used to show the presence of bugs, but never to show their absence."
<< please vote!! >></div>
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Older than I've been here and I've been here 29 years!
It's z80 assembly code
originally ran on a 500KHz NSC800
2nd generation processor was a real z80
current processor is an z180
I remember taking over development when I joined in 1985. At that time it was compiled under CP/M and the 8" floppy disks really were floppy.
modified 21-May-15 9:16am.
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Thanks for the trip down memory lane.
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omg... z80 was the first assembler i ever learned back in '86 (or '85).
Meeeeeeeemory... all alone in the mooooonliiiiiight.
ok this is *really* old
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In our organization we do have a old code running FINE at production, it was developed in VB6 12+ years back, and amazingly it is still running in GOOD condition.
12 years back we have Win 98, Win XP but the code still running with Win 7 and Win 8 with 32 and 64 bit OS
Hats Off to VB 6 
Find More .Net development tips at : .NET Tips
The only reason people get lost in thought is because it's unfamiliar territory.
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It's actually hats off to the developers not vb
We can’t stop here, this is bat country - Hunter S Thompson RIP
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Jeremy Falcon
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Running Win98 in production a dozen years ago was insane at a level that actually makes doing greenfield dev in VB6 today look like a good idea.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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I checked with a friend who still works where I used to and they are still running some code I wrote in 1981!
- I would love to change the world, but they won’t give me the source code.
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10 PRINT "HELLO"
20 GOTO 10
?
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No, it was in FORTRAN.
- I would love to change the world, but they won’t give me the source code.
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... I'm not allowed near the mainframes. But the company is 160 years old, so I wouldn't be surprised if there's code from the 50s still in use. 
IT JUST WORKS!
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160?!? What company do you work for?
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
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I've got two candidates; one's an application I was hired to start working on the second version of a decade ago. The second's probably close to 20 years old (maybe older if the parts that look like C with classes were originally just C); but while we're on contract to deliver a version that's had an IA scrub and runs on modern versions of windows (vs the customer's NT4 only installer); but we haven't delivered a build yet so they're still using one from the original developer.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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But I'd be more interested in the average age of most production code...
Regards,
Rob Philpott.
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