If they have already turned 19 this year (2010) they were born in 1991, if they will be 20 sometime this year they were born in 1990.
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If you are 19 now then you were born in 1990
1991
1991
If someone is turning 32 in the year 2010, they were born in 1978.
At the time of answering, they would be 19. They would celebrate their 20th birthday this year (2013)