A lot of Go may be more mature than Java, as the are not adding new language features every other year.

Go as a language is remarkably stable, and they keep things simple.

The best way to screw up and introduce bugs is by creating complexity, and the Java world knows how to create complexity in spades. With complexity comes bugs.

Fixing problems and weeding out bugs require a sound understanding of your code and your system. If the system is very complex, you ability to reason about it and diagnose the problem diminishes.

If age was the mark of the robustness of a system, we should all be writing in assembly code, or perhaps C.