Was it perhaps from the Up Series - a famous British series of documentaries chronicling the lives of citizens, starting at the age of 7 and catching up every 7 years - or one of the international offshoots?
The British version of the second film is called Seven Plus 7, but there are also international versions, like 14 Up Japan, 14 Up in America, 14 Up in South Africa, etc. Filmmakers recently started remaking the original British series, as well. 14 Up 2000 came out a few years ago.
Also, there's a similar Australian documentary called 14's Good, 18's Better.
I hope this helps. Let me know if one of these films is the one you're thinking of.
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