Four Top Contenders at Apple to Succeed Tim Cook

Tim Cook shows no signs of slowing down. Famous for rising before the sun to answer emails and work out, he has devoted much of his life to Apple AAPL 1.63%increase; green up pointing triangle and has said he wants to stay at the company for some time.

Yet since Cook recently turned 65, an age when other executives are often headed into retirement, analysts, investors and Apple watchers have been abuzz with chatter: Who is next in line to run perhaps the most iconic American company?