In recent weeks, Mr. Cook has tended to administrative matters that never interested Mr. Jobs, such as promotions and corporate reporting structures, according to people familiar with the matter. The new chief executive, 50 years old, has also been more communicative with employees than his predecessor…

“Next March I’ll be in my eighties, but to look at me you’d think I was only in my sixties because I’ve taken care of myself, looked after my health, and I love work. I think retirement is the worst of western societies’ institutions. When people retire they become detached, grow old and stop looking after themselves. Enthusiasm for life dies out and energy levels drop, and they effectively kill themselves, even though they’re still alive. I’m not planning to retire even if I leave my position here after a year or two. I’ll dedicate myself to writing, I might write a book or two. My daughter is a very successful novelist with five books, and I plan to move on from my work, and I’m thinking of writing about the Arab World, perhaps a historical narrative with analysis for the future.”