In 2011, you're 20 until your birthday, and on your birthday, you turn 21.
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If you were born in 1990, then you'll turn 22 on your birthday in 2012.
In 2010 they will be twenty years of age.
just subtract 1990 from 2010. Answer is 20 years. Count the months from October til now. Answer is five (nearly). A person born on 8th October 1990 is 20 year and 5 months!!
At January 20th 2009 you would be 19 years old
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