I used to see Peter LaFarge around Goerde's Folk City in New York around the same time Dylan and Phil Ochs were starting out there. I don't think he was that old (born in 1929?). As far as being a cowboy, that may be but I think he was also the son (or adopted son) of Oliver LaFarge, well known and respected writer whose novels often had Indian settings. My impression was that like so many of us at the time he affected a "rurality" and downplayed his formal education.
Because I liked traditional music, I had a hard time appreiating the singing and songs of all three of them in 1960 "but Phil Ochs really did grown on me).