Paul talks about "Get Back," "Lyrics" and finishing Lennon's "Now and Then" in new interview

The New Yorker has a lengthy interview with Paul this week focused on "The Beatles: Get Back" film, his "Lyrics" book, and more. Many repeated tales, of course, but there is this nugget:

After Lennon died, Ono gave the surviving members demos that he’d recorded at home. McCartney, Starr, and Harrison worked on three, but added tracks only to “Free as a Bird” and “Real Love.” Now McCartney wants to fill out the last of them, “Now and Then,” even though Harrison had declared the song “fucking rubbish.” McCartney also wants to go back on the road, a life that he finds invigorating. “I’ve been doing this for a long time,” he said. “So another me takes over: Professional Performing Paul—the triple ‘P’!” If the question is “Why do you keep at it?,” the answer is plain: “I plan to continue living. That’s the central idea.”