<ul data-eligibleForWebStory="false">McDonalds founder Ray Kroc started the company at age 52, well past middle age.Ray Kroc took a solitary hamburger stand in California and turned it into a billion-dollar company in 17 years.Today, McDonalds is a publicly traded company with a market cap of over $200 billion and annual revenues of $26 billion.The success of McDonalds proves that it all started from a side hustle for Ray Kroc.