If you want something that will grow with them, consider a Raspberry Pi. There is a simple graphical language called Scratch. If that's already not advanced eno

If you want something that will grow with them, consider a Raspberry Pi. There is a simple graphical language called Scratch. If that's already not advanced enough, then there is every language under the sun available. Python, as someone else mentioned, is a great place to start because it is easy, powerful, well supported everywhere, and in demand. It's main strength when it comes to teaching is that the language itself is limited to the basic constructs, so there is no confusion around really similar ones like there is in many other languages. So there is a lower learning curve for getting something productive into code. From there, they can go just about anywhere since Raspberry Pi supports all of the major languages, and a good lot of them are already installed by default since they are used by the OS to begin with. The other thing is that they could also do some electronic projects if that ends up being of interest. The Pi is pretty awesome for that.