"Younger Than That Now" is subtitled "The Collected Interviews with Bob Dylan," which implies you'll find every interview Dylan has given through the years. That may be an impossible task, but certainly it would be practical to collect the interviews he gave to major publications in one thick volume.
"Younger Than That Now" doesn't do that. Notably absent are the interviews I was hoping to find, particularly Dylan's hilariously elusive conversation with Jann Wenner in a 1969 issue of Rolling Stone in which Wenner tries and fails to get Dylan to acknowledge that he's a "youth leader" and a spokesman for someone other than himself. Then there's the 1978 interview with Jonathan Cott, also in Rolling Stone, that, in hindsight, hinted at his conversion to Christianity while also demonstrating his sense of humor.
So, "Younger Than That Now" isn't definitive. As long as you know that before you dive in, it's a worthwhile read collecting many memorable exchanges Dylan had with the press through the years.
Brian W. Fairbanks