In a short clip from an interview with Dr. Drew, tweeted here, RFK jr. says:

When my uncle left office in 1964, 80% of Americans trusted the government and even more trusted the media... Today 22% of Americans trust the government and those are people who I would say are not paying attention.

JFK didn't "leave office", he had his brains blown out, and that was in 1963.

Ted was sworn in as Senator in 1962, and didn't "leave office" until he died the next century.

Did he might have meant to say "father" rather than "uncle"? RFK stepped down as AG in 1964 to run for the Senate, and was sworn in only 4 months later in 1965. Hardly seems a landmark break to stand out in the mind of a nine-year-old.