If you are 21 years old, you were born in 1990. (2011)
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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
21 if you have had your birthday this year. If not, 20.