The late Charlie Munger (right) was Warren Buffett's business partner.SCOTT MORGAN/REUTERSCharlie Munger doubled his money on a contrarian bet at age 99, Li Lu says.Warren Buffett's late partner got the idea from Barron's magazine after 50 years of reading.Li recalled a lunch with Elon Musk and Munger that showed their huge differences in risk tolerance.Charlie Munger was still sniffing out bargains and scoring big gains at age 99, says a close friend of the late investing icon.Munger, Warren Buffett's business partner and Berkshire Hathaway's vice chairman for more than four decades, died in late November 2023, about a month shy of his 100th birthday.He "read Barron's magazine every week for 50 years and only made one investment," Li Lu told Zhenge Island, a Chinese social network, in a rare interview marking the first anniversary of Munger's death."There was a stock that everyone disliked, and it might not be particularly politically correct," Li said.