Some Riddles

These riddles are a lot easier than the last one I posted.

Here's One:

Harry was 20 years old in 1980, but only 15 years old in 1985. How is this possible?

Here's the second one:

Once there was a man, he lived in a apartment. The apartment was 40 stories high, the man lived on the 30th floor. He worked everyday in town. 

On sunny days the man comes back to the apartment after a days work, but he only goes up the elevator to the 8th floor and walks the rest of the way up the stairs to his floor. 

But on rainy days he comes back to the apartment after the days work, and goes up the elevator all the way to his floor. Why Does He Do This?

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