Hi, when do you think is a good age for kids to start coding?

I run Saturday Kids, a digital literacy school for kids. We teach kids as young as six Scratch, a visual programming language developed by MIT Media Lab. I sent my 5 year old boy Camper to a couple of our Scratch classes. He understands the logic, but because he cannot read he doesn't know which blocks to use. Camper loves LightBot Jr though. It's a coding puzzle app that teaches kids how to command a robot. No reading required, so relatively easy for younger kids to pick up. If you are concerned about screen time you can try Kibo and Bee Bot. https://itunes.apple.com/us/app/lightbot-jr-coding-puzzles/id858640629?mt=8 http://kinderlabrobotics.com/kibo/ https://www.bee-bot.us/