Next month, Warren Buffett will celebrate his 92nd birthday. That puts him in a select group, considering the average lifespan of Americans is around 78 years. But Buffett also belongs to an even rarer group: He's one of the four wealthiest individuals in the U.S. 

Buffett's net worth currently tops $99 billion, according to Forbes. His fortune has more than tripled over the past two decades. And there's one stock that has made Buffett $62 billion richer since 2002.

The stock that's made Buffett a much wealthier man is, of course, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B). Roughly 99% of the legendary investor's personal wealth is tied to the conglomerate. 

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Source Fool.com