"Seven Years of Life" — This might be the most hardcore thing humanity has ever done.

In 1964, the BBC filmed 14 seven-year-old children, asking them what they wanted to be when they grew up. Then they went back every seven years, filming them until their hair was completely white.
Some said at age 7 they wanted to be lawyers, and they actually became them. Some said, "People like us can't get into Cambridge," and they didn't. Class, marriage, dreams, disillusionment — 63 years, the camera doesn't lie.
Director Michael Apted made 9 installments, and he passed away first.
Now the 10th installment, "70 Up," is here, with Asif Kapadia taking over. He says it's "a great honor." No need to be modest, this is an honor.
They film one installment every 7 years, edit for a year, and live for six.
The people in the footage are racing against time, not knowing if they'll still be in front of the camera in the next round.