42 years previous to the current year.
People born in 1970 will be 42 in 2012.
1969
1969
2017 − 42 = 1975 was the year of birth.
1968
If you turn 42 in the year 2012 then you were born in 1970.
People born in 1970 will be 42 in 2012.
1969
1969
2017 − 42 = 1975 was the year of birth.
Well, we are living in 2013 right now so by simple subtraction, you would find that a 42 year-old was born in 1971 (2013- 42 = 1971)
Take the current year and subtract 42 from it. For example, if the year was 1962, then subtracting 42 from it would equal 1920.
1967
1968. To figure that out you subtract the year now to 42. So it would be 2010-42 and that equals 1968.
1968
As today is the 1st January 2010, you were born in the year 1967.
If they have already had their birthday this year, then they were born in 1969. If they have not already had their birthday this year, they will be 42 by the end of the year, and so were born in 1968.