Science Buddies: "Ask an Expert"

Hi, I'm doing a research. here for I have the most experienced science peoplw To my question on age estimation of a human being to be able to view & to answer! The question is about my kid who was allowed to make a music video for a double soft advertising! You can get this video from 3:30 to view from start to finish! However, the question is what is the lowest possible age in the particular case that the kid with the Red cap on might be at the time of the video recording of course?
This is the URL of the video: http://youtu.be/wI_EhueSKTg

The Ask an Expert forums are for K-12 student science projects.

This question (and request to view the video) do not seem appropriate in these forums.

Science Buddies