Any person, grown or otherwise, will benefit from any exposure to programming patterns and methods. This is tremendous and exciting.
I 100% believe the the world will be a better place if everyone touched code, and understood computer science, at least at a high level. The benefits of the modes of thinking to begin to connect the dots would be tremendous for our society, we could catch fire (in a good way).
Imagine a generation, in it's entirety, familiar with computer science - Imagine one day a government, where each person, knew at least a little, of how to think abstractly and logically.
Steve Jobs once said the computer is like a bicycle for the brain. I still believe that statement to be true though we use most of our technology for entertainment when it can be so easily applied, to problems, not just as solutions themselves, but as a model for problem solving. I feel like we miss the boat but we're getting closer with things like this.
As a fan boy I obviously have my issues and feel like Tim should email me personally about certain things but this is tremendous, this will get kids excited about interacting with their env. through software, it will help them connect the dots that these things aren't just for snapchat but can be used to change the world.