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How old is..

How old is ...
...the universe?
13.4 billion years old
...the milky way?
10 billion years old
...the sun? 
4.6 billion years old
...Earth?
4.6 billion years old
...the moon?
4.5 billion years old 
...life on earth?
3.8 billion years old
...Homo sapiens (the human species)
200,000 years old

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