Murdoch, 84, is one of only two S&P 500 CEOs over age 81.
Read More Who is the oldest CEO in the S&P 500?
Berkshire Hathaway's Buffett is also 84, born a few months before Murdoch. Next oldest is Robert Wilmers of M&T Bank. Wilmers, who was listed as 80 in a March filing, had been CEO many years ago, retired and then came back to run it again.
So Buffett's lead gaps out from a few months to several years. No other CEOs are over 80, according to data from S&P Capital IQ.
The average age is in the mid-50s in every sector. Only one CEO, Facebook's Mark Zuckerberg, is under 40, at a youthful 31. Here are the average ranges, by sector, of CEO age in the S&P 500.