With Tim Cook turning 65 on Saturday, Nov. 1, talks have been growing around the question of who his successor as Apple CEO could be, should he choose to retire. Cook has made no announcement that he'll be stepping down, but according to Bloomberg's Mark Gurman, the tech giant is working behind the scenes to ensure a seamless transition when the time does come.

Cook replaced Steve Jobs in 2011, and after a period of uncertainty, Cook ushered Apple into its most profitable era. Stock-watching website Stocktwits reports that the company's stock has increased by around 1,800% since Cook took over leading the company.

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