According to the Calliope FAQ and Mission Statement, it's targeted at "3rd grade and up" (meaning approx. 8-10 year old) and in addition to the block editor sup

According to the Calliope FAQ and Mission Statement, it's targeted at "3rd grade and up" (meaning approx. 8-10 year old) and in addition to the block editor supports mbed, with Micro-Python support planned for fall 2016.