What age? Let's say 65 years old.
Treating year of birth as a number (which it is!), just add them:
1979 + 65 = ?
You can do it in your head. Or longhand on paper. Or use a calculator.
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They would be 33 if they were born in 1979
2004 - 1979 = 25
30
Well it depends on which month you were born in. But take 2012-1979=33 so you would be about 33.
As of September 2011, someone born on December 1, 1979 would be 31 years old.