Rockhen, and others, ut 10 or 11.I've just been working in a series of Staffordshire primary schools, and we did a day in each of ten schools, all with the 10/11 year olds. Everybody sung there heads off, whatever you asked them to sing. In front of substantial audiences, at the end of one day's work. Then we went into a secondary school, same area, and did a day with a class of 11/12 year olds. Completely different world. All giggles, unprepared to sing in front of an audience. That kind of stuff.This seems to be a pretty universal phenomenon, though the age at which the change ocurs is a little lower than it was a generation ago.