Tesla CEO Elon Musk speaks during a meeting with Chinese Premier Li Keqiang (not pictured) at the Zhongnanhai leadership compound in Beijing on January 9, 2019.

Elon Musk is an optimist: There is no better time to be alive, Musk says. "Humanity can address a lot of the suffering that occurs in the world and make things a lot better. I think a lot of times people are quite sort of negative about the present and about the future, but really if you are a student of history, when else would you really want to be alive?" Musk said Tuesday at a Neuralink event at the California Academy of Sciences. "Now is the best time, pretty much. Those who think the past is better have not read enough history," Musk said.

Bill Gates has read his history, and he makes a similar argument to Musk. As evidence, Gates uses examples from psychologist and Harvard professor Steven Pinker's book "Enlightenment Now": In 1920, the average person spent 11.5 hours each week doing laundry, and in 2014, that fell to an hour and a half, Gates writes on his blog, Gates Notes. He also notes that the global IQ score is rising three IQ points each decade thanks to better nutrition and a cleaner environment aiding in brain development. "The world is getting better, even if it doesn't always feel that way," Gates wrote in the 2018 post. Then there's Warren Buffett: While the investor urges that the stark wealth inequality in America needs to be addressed, he says capitalism and the country's growing wealth help make this the best time to be alive.

"Early Americans, we should emphasize, were neither smarter nor more hard working than those people who toiled century after century before them. But those venturesome pioneers crafted a system that unleashed human potential, and their successors built upon it," Buffett wrote in his 2016 letter to Berkshire Hathaway shareholders. The result is that each generation leads a better life than the past. "This economic creation will deliver increasing wealth to our progeny far into the future. Yes, the build-up of wealth will be interrupted for short periods from time to time. It will not, however, be stopped," Buffett says. "I'll repeat what I've both said in the past and expect to say in future years: Babies born in America today are the luckiest crop in history." Though it may seem easy to have such optimism when you're a billionaire like Musk, Gates and Buffett, Gates says he's "optimistic about the future because I know that advances in human knowledge have improved life for billions of people, and I am confident they will keep doing so." See also: 5 timeless lessons for success from the early years of Warren Buffett's annual shareholder letters Neuralink president: You have to be 'very careful' telling Elon Musk something is impossible Jeff Bezos: I spend my billions on space because we're destroying Earth