20
19 years old.
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If the person is turning 22 in 2012 they were born in 1990. If they were already 22 in 2012 and will turn 23, they were born in 1989.
A 32-year-old is born in the year 1989 if we assume that the person has celebrated their birthday in the current year.
There is no such person. Miley's half-brother is named Trace (born February 24, 1989).
Current Age = Current Year - Year of Birth, if the person has had a birthday in the current year and one year less than that if not.
um... No such person exist. But Corbin Bleu was born on February 21, 1989 and Zack efron was born on October 18,1987.
Age Now = Year Now - Year of Birth (if the person has had their birthday this year, and one less if they have not).
2009 minus 1989 is 20. However, depending on when your birthday is, a person born in 1989 could be either 19 or 20 in 2009. (The older age would be for someone whose birthday had already happened since this is 2009.)
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20