Calculated in 2010, the year of birth is 1989.
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2011 - 21 = 1990
Born June 25 1990 would make you 21 today.
In the year 2014, if you had had your birthday you would be 21, if not you would be 20.
A person who was 21 in 2011 was born in 1990. An individual who turned 21 in 2012 was born in 1991, those who turned 21 in 2013 were born in 1992, and people celebrating their 21st birthday in 2014 were born in 1993.
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.