They would be 22 or 23.
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As of October 2011, someone born in July 1987 would be 24 years old.
If you were born in 1987 you will turn 25 in 2012.
On his birthday in the 2009, a person who born in the 1987 be 22.
23
Subtract 1987 from 2009. The answer is 22.