Before your birthday in December 2010, you're 27. On your birthday in December 2010, you turn 28.
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If you were born December 9, 1982 you will currently be 27 year old.
Just before your birthday in December 2010, you're 37. On your birthday in December 2010, you turn 38, and you remain 38 until your birthday in December 2011.
December 19 2017 would be 14th birthday so 15th birthday would not be until December 19 2018
You would be 16 yrs old.
If you were born in December 1968, then you turn 43 on your birthday in December 2011.