Oh, dude, if someone hit the big 5-0 in 2009, you just gotta do some basic math. So, like, you take 2009 and subtract 50 years, which lands you in the thrilling year of 1959. It's like time travel, but without the cool DeLorean.
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If someone turned 50 in 2009, they would have been born in 1959. This is because you subtract the age from the current year to find the birth year. In this case, 2009 - 50 = 1959.
If you were born in 1974, you would have turned 35 in 2009.
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.
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.
1931
If you have already turned 31 in 2009 you were born in 1978, if you are 31 now and your 32 birthday is still to come this year, you would have been born in 1977.