Seven Up! has to be one of the best movies I've never seen (but is on my bucket list).
From Almond's obit in the Times (my emphasis):
Forty minutes long and shot in black and white, “Seven Up!” examined the enduring British class system through the lives of 14 7-year-olds from across the socioeconomic spectrum. He can be heard asking the children — 10 boys and four girls — questions about family, love and adult aspirations.
Though the program was enthusiastically received by viewers and critics, it was intended as a one-off, and Mr. Almond later returned to Canada, where he had a successful career as a TV and film director and, in recent years, a novelist.
[Director Michael] Apted came up with the idea of revisiting the children at seven-year intervals. He directed the next installment, “7 Plus Seven” (1970), and those that followed — “21 Up” (1977), “28 Up” (1984) and so on — seeing his subjects through their professional lives, marriage and parenthood, ambitions fulfilled and ambitions thwarted. The most recent entry, “56 Up,” was released in 2012 in Britain.