When Warren Buffett stepped down as CEO of diversified holding company Berkshire Hathaway on 31 December, he was a remarkable 95 years old.

After spearheading Berkshire Hathaway for some 60 years, he handed the reins over to Greg Abel, who’s been with the company since 1999.

But Buffett, being the man that he is, still keeps his finger on the market’s pulse, working from the company office and advising Abel.

What you may not know is that Warren Buffett started his career with very little money. But by the 1980s he’d notched up his first billion dollars. And, as of January this year, he was reported to be worth almost US$149 billion.

With that astonishing success in mind, here are three golden investing rules…