Warren Buffett will step down at age 95. Here’s how rare it is be working at that age. - MarketWatch

1. Warren Buffett, 95, steps down as CEO but remains chair of Berkshire Hathaway. 2. Only about 6,000 95-year-olds are currently in the workforce in the U.S. 3. Buffett likely maxed out on potential Social Security benefits long ago. 4. Transition in leadership could affect investor confidence in BRK.A. 5. BRK.A and BRK.B stocks see slight declines amid news.