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12 years old
12 because 12 + 2 = 14. 12 - 5 = 7, which is half of 14. So in two years you will be twice as old as you are now.
12 years is 378,683,112 seconds.
Earth is about 4.5 to 4.6 billion years old. The universe is about 13.7 billion years old.
62 and a half years old.