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.
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Either 1980 (January 1st to November 13th) or 1979 (November 14th to December 21st) depending when you were born.
At the end of 2011, you would be 22.
At the end of 2011, you would be 22.
20
If someone turns 21 in 2011 then they were born in 1990. If someone's birthday is in January, February, March, April, May, June, July, or August 1990, then they would turn 21 in those months in 2011. The majority of their 21st year is in 2011. However, is someone's birthday is in the later months- September, October, November, or December- of 1990, then they would turn 21 in the last four months of 2011, and a major piece of their 21st year would be in 2012. Which means that as of October 2012, they would just be turning 22.