I am listening to the first movement...and let me say...wow! I would not know this was a youth orchestra by the playing.
I think the term "youth orchestra" here may be a bit misleading. The upper age limit of this group is 28, so it's not what we commonly think of as a youth orchestra—one made up of students from several local high schools—but a sort of pre-professional training orchestra, more like the New World Symphony in Miami or the Civic Orchestra in Chicago.
James