Neil Young is the youngest, born just after WWII was over. but still is not a Boomer. Boomers would start being born the following year. & of course so many of their fans were/are Boomers. but CSNY themselves belong to that narrow slice of time: WWII. as did so many of the biggest stars of that era.

The Beatles, Bob Dylan, Mick Jagger, Joni Mitchell, Roger Daltrey, so many—WWII. I paid a lot of attention to ppl's birthdays back then b/c I was farting around with astrology. the kind of thing one did then. I got so I could recognize that cohort. You could tell who came before, who came after.