Warren Buffett's right-hand man Charlie Munger jokes that the investment legend's favorite See's Candies is the key to longevity

• Berkshire Hathaway investing icon Charlie Munger joked that peanut brittle from See's Candies is the "key to longevity."
• Berkshire boss Warren Buffett bought See's Candies in 1972.
• Munger, who is 99, snacked on the treat during a CNBC interview in which he also hit out against crypto. 

Want to live a long life? Maybe take a cue from investing icon Charlie Munger at Berkshire Hathaway. 

"I'm eating this good peanut brittle," he told CNBC during an interview Tuesday. "That's what you want to do if you want to live to be 99," he said, holding up a piece of the sweet treat during a Valentine's Day appearance.