Berkshire Hathaway chairman and CEO Warren Buffett turns 88 today. The legendary investor, who has amassed a fortune of more than $87 billion over his career, got into the investing game early on. He bought his first stock, shares of Cities Service for $38 apiece, at age 11.

What he's learned since that purchase in 1942 is to buy, hold and not watch the markets too closely.

"No matter what the headlines say … American business is going to do fine over time," Buffett told Judy Woodruff of PBS NewsHour in 2017. "Occasionally we go off the tracks with bubbles … but it will never permanently derail us."

In fact, when he bought his first stock in 1942, the headlines didn't look good, he noted: "We were losing the war in the Pacific."

Markets go up and down every day, but that doesn't necessarily mean there's significance to every move. As an investor, it helps to be patient and to accept a certain level of uncertainty.