I found some Perl code of my coworker's in a recent internal product. It had his name at the top of the file, and the year 1997. I mentioned it to him, so he pu

I found some Perl code of my coworker's in a recent internal product. It had his name at the top of the file, and the year 1997. I mentioned it to him, so he pulled out the original in his ~/bin, and we diffed them. The core program was unchanged, there were just some minor changes for this specific application (e.g. the path changed, and there was like one if block added for this purpose). So it was pretty much unchanged for over 15 years.