Something like PICO-8 would work great for young programmers I think http://www.lexaloffle.com/pico-8.php
I've been looking for something that gives a modern, live-coding-ish experience similar to how you used to program in BASIC on the Commodore 64. No clutter, a fullscreen immediate editor/REPL in one window, nice big text, etc.
The closest I've found to what I'm after (until now that is) is (fluxus) (http://www.pawfal.org/fluxus/). Would really really love to hear of any others.
1. http://elm-lang.org/try 2. Clojurescript + figwheel + reagent. 3. ipython notebook