Proving that age is just a number, Berkshire Hathaway chief executive, Warren Buffett, 88, and vice-chairman, Charlie Munger, 95, answered questions for seven hours at the company’s AGM this weekend.

Berkshire Hathaway, the conglomerate run by billionaire Warren Buffett, has reported a quarterly operating profit rise of 67%, as insurance underwriting rebounded and several business units benefited from a growing economy.

Berkshire Hathaway shareholders on Saturday celebrated Warren Buffett’s 50th anniversary running the conglomerate, as the billionaire expressed optimism the company would thrive over the long haul, even after he is gone.