Bill Gates Birthday. William Henry Gates III, a.k.a. Bill Gates, is the co-founder and former CEO of Microsoft. He has stepped down from the day-to-day operations of Microsoft and his other holdings to focus on charities that he runs with his wife, Melinda, and his father, William H. Gates Jr. He is the richest American and a contender for the title of richest person in the world. Bill Gates is 62 years old and was born in Seattle WA. There are many famous birthdays in October. You can use the drop down menus above to choose a celebrity birthday by name or celebrity birthday by month.