Of course that depends on what day you do the calculation from, but to find out how many years old you are, you can simply subtract the year you were born from the current year. 2013 - 1971 ia 42 if your birthday has already passed. If it hasn't, you are still 41 until your birthday.
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Subtract 1971 from 2011 and you will have your answer.
If you were born in September 1980 you would currently be 29; but in September you will be 30.
You would be 39 years old.
You would be 73, 74 in September.
If you were born in September of 1972, you would be 37 today.