As of June 1, 2011, someone born on May 31, 1990 would be 21 years old.
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You turn 39 on 31st December 2010.
19; you will 20 on May 12.
As of 2009, about 20 years old.
You will celebrate your 31st birthday this year (2017).
2013 - 1990 = 23 If you were born in 1990, you would be 23 in 2013.