You would turn 24 years old on December 31, 2013.
If you were born on The 21st of December on 1989, you would be 20 years old 19 years old, you would only be 20 on the 21st of December.
People born in 1989 would be 24 in 2013. In 2014, they will be 25.
Taylor Swift was 23 for most of 2013 - she turned 24 on December 13 (born December 13, 1989).
That person is 23 for the first 364 days of 2013, and turns 24 on his birthday, on December 31, 2013.
On your birthday in 2013, you would turn 24 .
You would be 28 turning 29 in December.
24
Taylor Allison Swift was born on December 13, 1989.
Dani Harmer was born on February 8, 1989. In 2013, she would have been 24 years old.
For most of 2014 you would be 24, but on the 31st of December you will be 25.
You would celebrate your 24th birthday this year (2013)
If a person was born on December 31, 1989, on their birthday in 2014, they would be turning 25 years old. This is done by subtracting the birth year from the year 2014.