Billionaire Microsoft founder Bill Gates reveals his biggest regret

He might be the richest man in the world, but Bill Gates has revealed even he has regrets.

The self-made billionaire Microsoft founder was taking part in a third "Ask Me Anything" chat for online forum Reddit, on Wednesday (28 January) when he was asked if there was anything in his life that he regretted.

"I feel pretty stupid that I don't know any foreign languages," said 59-year-old. "I took Latin and Greek in high school and got As and I guess it helps my vocabulary but I wish I knew French or Arabic or Chinese.

"I keep hoping to get time to study one of these - probably French because it is the easiest," he added.

The philanthropist added that he is impressed by Facebook founder Mark Zuckerberg's linguistic efforts, after the 30-year-old CEO learnt mandarin and even managed to conduct an entire Q & A session with a Chinese audience.

Also a self-made billionaire worth $33.6billion, Zuckerberg learned the language partly because his Chinese-American wife's grandmother only speaks Chinese.

"I did Duolingo for a while but didn't keep it up. Mark Zuckerberg amazingly learned Mandarin and did a Q&A with Chinese students – incredible," said Gates.

The former Microsoft boss is the world's richest man with a net worth of more than $80bn (£53bn) and lives with his family in a mansion worth more than $120million in his hometown of Medina, Washington.

But as he revealed, despite his billions, he is not averse to the mundane duties of normal family life.

Last February, during his second 'Ask Me Anything" session, he revealed that he likes to do the dishes every night and admitted that he would pick up a $100 bill if he found it on the street.

He said he enjoys Indian and Thai food and his biggest splurge is a private jet. When asked a life lesson he had to learn the hard way, the generous philanthropist said he has a bad habit of staying up too late.

"Don't stay up too late even if the book is really exciting. You will regret it in the morning. I am still working on this problem," he said.

The father-of-three, who took the top spot on Forbes 28th Annual Billionaires list last year for the fourth time also revealed last year that he was not going to leave trust funds to his children.