There is a great film by Philip Leclerc, Divided, about the modern youth ministry and its challenges. He comes to the conclusion that such an age-segregated approach to reaching young people is founded on unbiblical principles. He speaks with many pastors, youth ministers, and young people as he explores this issue. This video is the interview he conducted with Voddie Bacuham for the film. It contains some of the segments that made it into the film, but most of it did not. You can watch the film, which is an hour, at their website.