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15
The answer depends on what year you were born.
On your birthday in 2012, you would turn 15.
If a person turns 15 in 2011, then they were born in 1996. In 2012, a 15-year-old would have been born in 1997. If they turn 15 in 2013, they were born in 1998. Which means then that turning 15 in 2014 means you were born in 1999. It's quite simple.
To determine your age in 2009 if you were born in 1994, you subtract 1994 from 2009. This calculation results in 15, so you would be 15 years old in 2009.