Scratch requires only a very basic understanding of terms, and has been widely extended, as in translated to many languages and perhaps completely visual versions have been made.

Here's a link to the base project → https://scratch.mit.edu

Sadly, I am still working on that.. My thoughts are on www.reddit.com/r/unseen_programming

Its structure is very similar to Luna. Instead of popup-lists, you can drag-drop functions into the program and connect them with lines.

But I don't know from what age it will work, they still must learn some symbols. +,- etc.

Alternatively, you could let them try fun computer-games that are close to programming. Like factoria.

You would need to find a pre-literate VPL, like Kidsym, or maybe Hands. Those are research languages, but there seem to be a lot of pre-literate visual data-flow and block languages out there these days, none of them is especially popular but they work fine in their own way.

Logical operations require the ability to read if not English than at least some form of formal grammar.