Today (November 14, 2009), you are 19. On December 20, 2009, you'll turn 20.
You really ought to know how to handle this kind of arithmetic problem by now.
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At January 20th 2009 you would be 19 years old
You are about to turn 23.
As of April 2011, you would be 20 years old.
If born on the 18th of December 1964, then on today, the 20th of July 2013, you would be 48.
He turned 24 on December 20th :D