I've watched this wonderful series from the beginning. The participants are genuine. They did not originally put themselves forward, although presumably their parents or guardians agreed on their behalf. They will all have fared differently, had highs and lows in their lives, but the editing has been carefully done so it does not seem intrusive. They are treated with respect and in their different ways, all of them seem to grow in stature as they age.
These people are such a contrast with the types who now appear in what is termed "reality tv". In 1964 there really was no such thing as "reality tv". Now tv is almost exclusively populated by people who want to "be on the telly" and as such are not representative of the rest of us who are happy to live our lives away from tv cameras and indeed, guard our privacy. I find it sad to hear children say they "want to be famous", which is so different from these people who, at the age of 7, wanted to be a jockey, a lawyer, an astronaut or work in Woolworths - much more worthy ambitions.