November 18th, 1928 is considered by most to be the official birthday of Mickey Mouse. That's because this is when the mouse first debuted to the public in the short film “Steamboat Willy.”
How do people celebrate?
People all around the world celebrate Mickey Mouse’s Birthday in a number of different ways. Some people spend the day watching Disney movies. Other people throw a “mock” birthday party at their homes – complete with a Mickey Mouse theme birthday cake. And other people travel to Walt Disney World to tell Mickey Mouse happy birthday!