Given that the year you're looking at is 2010, if you were 20, you would be born in 1990.
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If you are now (2010) 20 years old then you were born in 1990.
Age Now = Year Now - Year of Birth (if the person has had their birthday this year, and one less if they have not). So, if you were born on 20 January 1968, on 20 January 2011 you would be 43 years old.
As of January 2010 the year of birth would be 1989 and will turn 21 on April 1st.
20 if you have had a birthday this year. 19 if you have not had your birthday yet this year.
It actually depends. If my birthday is in October and I am 20 on April 24, 2009, then I was born in 1988. If my birthday is in January and I am 20 on April 24, 2009, then I was born in 1989. So your answer depends on what month the person is born in.