Julia 1.0 was released in 2018. That is just 5 years ago. I would say that is very young. Especially since a language today needs more than in the past. Julia has package manager, virtual environments, version management. Stuff that tends to be bolted on much later.

You needed much less stuff supported out of the box when Python first came on the scene. Today expectations have gotten much bigger. A minimal viable language has far more requirements.

Yes, Python is 32 years old by now, and the first 10 years was largely ignored, I bet most don't even remember Zope.

Absolutely, Rust was 9 years old when it hit 1.0