Who is MrBeast? Meet the 25-year-old YouTube star who's famous for giving away millions of dollars to strangers and says he's not rich.

• MrBeast is one of the most-viewed YouTubers thanks to his attention-grabbing stunts.
• He earns between $600 to $700 million a year but still doesn't consider himself wealthy. 
• See how the 25-year-old leveraged his fame into a globally recognized brand. 

At 25 years old, Jimmy Donaldson, also known as MrBeast, is one of YouTube's most-viewed and highest-paid creators.