Haskell is the youngest language that isn’t derivative.Monads for IO weren’t being seriously used until the late 90s. All the imperative C derivative languages are much older.
A very young language that is (to my knowledge) not derivative of older ones unless you count Excel: https://www.luna-lang.org
It comes with C, JS, and Haskell interoperability, and it's implemented in Haskell, but the heart of the language is its visual representation. I have personally never seen anything like it before.
