Mark Cuban is helping people set a New Year’s resolution that can help them grow richer. 

On Sunday, the Dallas Mavericks owner told Bill Maher on the “Club Random” podcast that everyone over 30 should read daily. Otherwise, they’re damaging themselves and their career, he said.

“Somebody 40 and over, even 30 and over, if you’re not reading, you’re f---ed… because you’re not expanding your mind,” Cuban said. “I tell my kids… ‘Somebody who doesn’t read lives one life, somebody who reads an unlimited number of lives.’”

In a 2016 study conducted by Yale University School of Public Health, researchers found reading 30 minutes a day helped participants 50 and older live on average, two years longer than their non-reading counterparts, regardless of health, wealth, gender, and education.

Cuban considers himself an active reader. In 2018, he told CNBC Make It he reads four to five hours per day studying national and local news, emails and technology research.

It seems that Cuban’s two daughters are also avid readers. In their early teenage years, both girls would be rewarded with “shoes or whatever they wanted” after they read a certain number of pages, Cuban said. Then, the family could discuss their readings.

But Cuban said he had to adopt a different strategy for his son, now 13, who doesn’t like to read. Cuban was worried that his kid’s hate for books could “hurt him long term” — until he realized his son  could learn differently. 

“They consume a lot of information [online],” Cuban said. “The challenge wasn’t so much, are they learning? …The challenge for me was understanding how they learn.”

After noticing his son watching YouTube and TikTok videos to learn, Cuban realized the platforms could act as parenting tools.

″[Tiktok] is the best parental tool in the world because… [it’s] artificial intelligence based off of what you watch,” Cuban said on the podcast. “So, if I want to know what my kids are into, I just look at their TikTok feeds.”