It's Warren Buffett's 96th birthday. His last year was one of the most transformational yet.

Warren Buffett is Berkshire Hathaway's chairman and former CEO. Daniel Zuchnik/WireImage Warren Buffett celebrates his 96th birthday on Sunday. He's retired as CEO, bet big on Alphabet, and ramped up his giving over the past 12 months. Here are the highlights from the legendary investor's landmark year. Happy birthday, Mr. Buffett. Investing legend Warren Buffett turns 96 on Sunday, and the 12 months since his 95th birthday have been truly transformational, featuring a huge career move and a…