Rust 1.0 was released in 2015 making it almost ten years old.

Rust, unlike Go, was largely developed in public. It also changed significantly between it's initial design and 1.0 so it feels like "cheating" to count pre-release versions.

Still, a decade is a significant milestone.

That's right. One of the knocks on those early versions was that every new release broke previous code in significant ways. Which is one reason that v. 1.0 was so important to the community. They could finally commit code using a stable language.