Luna visual programming language beta release
luna-lang.org
luna-lang.org
The idea is as follows: Devices like tablets and smartphones are naturally usable by 4-year old with minimal and even no instructions even if they can't read yet. Is there a visual programming language that can be implemented on such devices that is usable by just 4 year old?
Here's a link to the base project → https://scratch.mit.edu
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.