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.
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If you are 21 years old, you were born in 1990. (2011)
In 2010 the year of birth is 1989.
Right now, it is 2013, so if you are 20 years old, you were born in 1992 or 1993. In general, if a person is 20 years old, that means that they were born in the year (this year minus 20) or (this year minus 21).
To determine how old you are in a specific year, you subtract your birth year from the year in question. In this case, subtract 1988 from 2009 to find that you would be 21 years old in 2009.
1989