Really old software can be referred to as "Mature," as opposed to "Decrepit." It can be extremely well-documented, and well-understood. Many times, there are tools that grow up, alongside the main code.
I wrote stuff that was still in use, 25 years later, because the folks that took it over, did a really good job of maintaining it.
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That's also a "It Depends™" thing.
Really old software can be referred to as "Mature," as opposed to "Decrepit." It can be extremely well-documented, and well-understood. Many times, there are tools that grow up, alongside the main code.
I wrote stuff that was still in use, 25 years later, because the folks that took it over, did a really good job of maintaining it.