Paul is 20 years old in 1980, but only 15 years old in 1985

Question: Paul is 20 years old in 1980, but only 15 years old in 1985.How is this possible?

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Question: What goes in the water black and comes out red?

Question: What loses its head in the morning and gets it back at night?

Question: What two things can you never eat for breakfast?

Question: What do you call a sad bird?