Love Is Just a Four Letter Word (1965). Bob Dylan /and other old-age wisdom/

This metafilter discussion about the good/bad of Earl Scruggs moving on from Lester Flatt leads to this Joan Baez/Earl Scruggs video, where Baez's voice kicks in after some introductory talk:

LOVE IS JUST A FOUR LETTER WORLD
Uploaded by Francis-Albert. - Music videos, artist interviews, concerts and more.

We saw a Joan Baez concert in San Jose several years ago. It was great, Joan's mom was in attendance, and I noticed my spouse was one of the youngest audience members. Uh, oh. This may have been the point where I realized I was no longer a kid. 

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