The health of 81-year-old Warren Buffett has been on investors’ minds before Berkshire Hathaway’s annual meeting, but many shareholders say they’re not that worried about Buffett’s prostate cancer diagnosis.

More than 30,000 people are expected to fill Omaha’s downtown arena and overflow rooms Saturday to hear Buffett and Berkshire Vice Chairman Charlie Munger answer questions for more than five hours.

Kevin Snook, of Lincoln, Neb., says he knows many people are worried about who will succeed Buffett as Berkshire’s chairman and CEO after his death. But Snook says he’s confident that Buffett and Berkshire’s board will chose a good person to lead the conglomerate.

John Zerngast, of Olathe, Kan., says he doesn’t worry about Buffett and the 88-year-old Munger because he’s confident in the value of the companies Berkshire owns.