When my son was about 5 years old, I set up a linux computer for him. I used a very basic floating window manager and created about 6 or 10 large desktop icons

When my son was about 5 years old, I set up a linux computer for him. I used a very basic floating window manager and created about 6 or 10 large desktop icons to run the things I had installed for him (Hyperspace Delivery Boy was a favorite 8-) One icon started a script which launched the media player in a specific directory. I highly recommend giving (very young) kids exposure to a wide variety of desktop user interfaces. Failure to do this has led to an entire generation (2 or 3?) of windoze based computer illiteracy. Computers really aren't all about right-clicking that thing that looks like a pineapple, then selecting Settings, etc...