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Do you know how old Mickey Mouse is? Can you believe that the cute mouse is already 80 years old? As the most famous mouse in the world，Mickey Mouse is likely to be the oldest mouse in the world．If we compare him to a man，Mickey Mouse is about the same age as a grandfather．

At Hong Kong Disneyland，Mickey Mouse's famous friends，including Donald Duck and Snow White，celebrated his birthday．Mickey Mouse's fans also traveled from all over the world and got together to celebrate his birthday．They were excited about the event．They wore costumes，colorful birthday hats and took photos to memorize the happy moment．

Mickey Mouse has already turned 80，but there is not a gray hair on his bead．His look has gone through very few changes over the years．He is still dressed in the same clothes as the time when he was created．Walt Disney created Mickey Mouse in the movie．Steamboat Willie．This was the first cartoon movie with sound．In this movie，Walt Disney provided the voice for Mickey Mouse．Now，Mickey Mouse's two black round ears have become a symbol of the Disney brand（品牌）．

根据上面的短文内容回答问题。

1．How old is Mickey Mouse?

2．Was there fl celebration for Mickey Mouse's birthday at Hong Kong Disneyland?

3．Who celebrated Mickey Mouse's birthday?

4．Is Steamboat Willie a cartoon movie or an action movie?

5．Why does the writer say there have been few changes to Mickey Mouse over the years?