You would be 2009-1997 = 12 years old. You use 2009 because your 13th birthday, December 2010 has not arrived yet.
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You would be eight years old, and you would turn nine in December
13.
If you were born in 1984 you would turn 13 in 1997.
If you were born December 9, 1982 you will currently be 27 year old.
If you were born in December 1968, then you turn 43 on your birthday in December 2011.