Warren Buffett, the legendary investor and fifth wealthiest person in the world, thinks he didn’t start getting old until he was 90. But once it hit him, it became “irreversible.” It’s one of the reasons he’s finally decided to step down at age 94 from Berkshire Hathaway,

But in recent years Buffett observed just how much energy his appointed successor brought to each working day. And how his own days had slowed. The two men were operating at diffe

"I didn't really start getting old … until I was about 90," Buffett said. "But when you start getting old, it does become — it's irreversible."