Rust was started in 2006 and launched publicly, I believe, in 2009, the same year as Go. The point stands that these are still fairly new, but it’s not nearly that new.
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.
But could say the same about Python pre-1995 or so.
My biggest problems with Rust, though, are Cargo and Crates.io, not the language.
There is a fundamental philosophical disagreement I have with the NPM style of package management and this method of handling dependencies. Like NPM, Crates.io is a chaotic wasteland, destined for a world of security & license problems and transitive dependency bloat.
But honestly I'm sick of having this out on this forum. You're welcome to your opinion. After 25 years of working, with various styles of build and dependency management: I have mine.
But I actually think it's more inspired by people coming from the NodeJS ecosystem than people coming from C++.