There is not enough information to say.
If today is there birthday, and they just turned 33, then they were born in 1977. On the other hand, they may have been born in December of 1976, and turned 33 in December of 2009 - in which case, they are still 33 now, and will be till next December.
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If they are 33 this year (2012) - they were born in 1979.
1975
33 in 2010: 1977 33 in 2011: 1978 33 in 2012: 1979
33 34 not 33 - 35 this year (2009)
If someone is turning 32 in the year 2010, they were born in 1978.