Historically, there never used to be a youth culture. This provocative documentary looks at the whys and hows of the seismic shifts in early-20th-century life, when the industrial revolution and coming global conflict opened a rift between adolescents and the prior generations, and how the chasm has continued to the present day. Archival photos and footage combine with diary entries for a compelling trip across the decades. 77 min. Widescreen; Soundtrack: English Dolby Digital 5.1; audio commentary; featurettes; bonus footage; theatrical trailer.