Looks like there's almost nothing in the forum about these, but it's a fascinating and unique project, following children into adulthood, for decades.
Does Who You Are at 7 Determine Who You Are at 63?
In 1964, with “Seven Up!” Michael Apted stumbled into making what has become the most profound documentary series in the history of cinema. Fifty-five years later, the project is reaching its conclusion.
“Seven Up!” aired on May 5, 1964. “It was one of those ideas,” Apted wrote later, “that sounded O.K. when you talked about it, but when you actually saw it, it was remarkable.” It landed like a grenade. "It was the truth of the class system out of the mouths of babes, and the whole country was shocked.”
Does Who You Are at 7 Determine Who You Are at 63? - The New York Times