I got turned onto the Up Series by a film buff friend. Basically, it started as an interview with a group of seven year olds back in the sixties as a glimpse of the leaders of England in the year 2000. Seven Up (the first movie) is hilarious. Some of the kids are super posh, some are orphans, and they all discuss money, race, school, free time, girlfriends/boyfriends, etc. Then things get more interesting because they decided to do follow-ups ever seven years, the most recent being 49 Up in 2005. They haven't kept track of all the kids, but I'm impressed they managed to get the few they did to come back. I'm on 21 Up right now. The first one you can stream, but for some reason even though it's on the same disk they don't stream 7 Plus Seven.
I would link to the wikipedia article, but it has massive spoilers, especially for the most adorable boy from Seven Up, so don't even looking, heh. The best thing I found out there is that apparently many copy-cat series have been started, most notably for me, JAPANESE. What I wouldn't give to see a bunch of Japanese kids rambling on about whatever the hell.