When Mike Lubow found himself sliding into his 70s, he recognized it as "memoir country." He assembled a collection of literary memorabilia composed of random moments he'd been jotting down in recent years. True love stories, business hijinks, family oddities, travel adventures, embarrassing moments, irrevocable missteps, philosophical insights and out-of-body journeys called "type travel." All this went into a book called Time Pieces, published in...