They Shall Not Grow Old (2018)

69 high school kids from a town in the industrial north of England went to battle in WW1. None came home. 100 years later, a group of young people from the same school decide to trace the links between themselves and their historical colleagues. As they do so, they arguably learn as much about themselves as their fallen heroes. Cynical teenagers who have seen and done everything? Don't bet on it. This film restores one's faith not only in the young people of the past but also those of the future.