It would depend on your date of birth.
If you were born today or earlier in the year, you would be 19.
If you were born after today, you would be 18.
http://www.mathcats.com/explore/age/calculator.html
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2013 - 1990 = 23 If you were born in 1990, you would be 23 in 2013.
Someone born in 1990 would be 23 on their birthday in 2013
As of June 1, 2011, someone born on May 31, 1990 would be 21 years old.
22
20 years old in July 2010. (2010 minus 1990 = 20)