Warren Buffett defended the size of Berkshire Hathaway’s (BRK.A) cash hoard, which doubled last year to $334.2 billion, saying the majority of his investors’ money would always be invested in equities,

The 94-year-old Buffett also acknowledged his advanced age in his annual letter, telling shareholders he now uses a cane and will spend less time fielding their questions at Berkshire's annual meeting in May.

Warren Buffett just released his widely anticipated annual letter to Berkshire Hathaway shareholders. As usual, it should be required reading for all investors.