Larry Ellison Retires Though the Oracle ( ORCL) CEO has shown no signs of slowing down, he is a senior citizen. At 68, Ellison is one of the older CEOs in tech, and it's not like he needs the money. Ellison is sixth on Forbes'billionaire list, with an estimated net worth of $36 billion. Ellison is so rich, he recently bought his own Hawaiian island, so it's not like he's scrounging pennies to put in the piggy bank. I don't think Ellison is going to step down next year, but I wouldn't be surprised by it either. Perhaps the death of his best friend, Steve Jobs, has got him ruminating about life. If he does indeed decide to call it quits, my two best guesses are internal choices as his replacement: Oracle co-presidents Safra Catz and Mark Hurd, who joined Oracle in 2005 and 2010, respectively. Ellison said Catz would be his successor "if I dropped dead tomorrow," but he's also said the replacement should be an engineer, neither of which Catz or Hurd are. Chalk this one up as highly unlikely, but you never say never in this business.