He was extremely hardworking, wise and smart, he knew the business in and out, but he was pretty much set in his ways and did not delegate, and was hampering the company's growth (many of this kind of people try to keep their company manageable by themselves).

He ended up being overthrown by a brilliantly executed palace coup (by a sociopath, but I digress), but he would have stayed until his death if left to his own decision.

Actually, for some of the most driven workaholics, being retired is kind of a death sentence, it really does shorten their lives (most, being old, don't adapt to change well).

My father is still young, but I'm betting he's going to do the same (he is the head of a law firm), and I'm glad not to have followed his career, he's going to cast a shadow over his potential successors for decades.

"It seems important to you that you stay relevant. For example, you’re active on Twitter.

"I don’t physically do it. My assistant does it for me. But I say what I want to say, and it gets on there."

That's almost precisely not being active on Twitter.