Mature does not imply old; it means feature-stable, proven and understood. An example I know, Canon's pro-level cameras are mature on the day that they go on s

Mature does not imply old; it means feature-stable, proven and understood. An example I know, Canon's pro-level cameras are mature on the day that they go on sale to the public because they have been tested around the world for a year or more to verify and debug the design. That's part of their appeal, users know that they're putting $8000 into a mature camera that will get the job done, though with fewer features and baubles than a Sony.