Warren Buffett, turning 95, will retire as Berkshire Hathaway CEO this year. Retirement experts and Buffett gurus explain why he worked for so long, with Kerry Hannon saying it was more than a job, it was his life’s work. Buffett’s global impact includes turning Berkshire into a trillion-dollar company with 400,000 employees.

Buffett’s net worth of $150 billion, despite giving $60 billion to charity, makes him one of the richest people. Retirement experts say people often work past 65 if they feel their output matters. Buffett’s immense clout allowed him to exit pressure-free when he felt it was time. Buffett cofounded the Giving Pledge to encourage the wealthy to give back.

Buffett worked into his 90s because he loved Berkshire, according to Buffett scholars. Philanthropic giving increased with age, building his reputation steadily. Steve Hanke noted Buffett’s passion for Berkshire as the essence of his story, loving his job so much he would “tap dance to work.” Buffett’s generous legacy is recognized by scholars and experts alike.

Read more at Yahoo Finance: Why Warren Buffett has stayed as Berkshire Hathaway CEO, the job he loved, into his mid-90s