What does mature code base mean?

It means that it has gone trough a very long and uninterrupted period of constant development and maintainence by people who are considered to be experts of the field.
 
I would say that "mature" means it has been around long enough so that all major and most minor bugs have been found and fixed.
 
It's just marketing, don't think about it too much.
Basically means FreeBSD is old.
FreeBSD is evolving, being developed and being added new features continuously to keep up with people's & industry's demands. That's why it is not old, but mature.

There is a difference ;)
 
When it comes to job offers, the term "you will work on a mature code base" usually meany that you will be in a world of pain and struggeling in a total mess of code kept together by spit and shoe strings, plus good hope.
In these terms, a lot of other projects might be labeled "mature code base", but *BSDs would then be something else.
 
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