Oh, dude, if someone is 45, they were born in 1976 or 1975. Like, you know, basic math and stuff. So, if you're looking for a specific year, it's one of those two. Cool, right?
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Well, if you're 45 years old now, you must have been born in 1977 or 1976 depending on your birthday. Math isn't rocket science, darling!
To determine someone's age in a specific year, you subtract their birth year from the target year. In this case, if you were born in 1964 and it was 2009, you would be 45 years old. This calculation is done by subtracting 1964 from 2009, which equals 45.
2009 - 45 = 1964
Someone born in 1967 would be 45 years old in 2012. (2012 - 1967 = 45)
Assuming the current year of 2010, someone born in 1964 who has had their birthday already this year would be 46 years old. If you have not had your birthday yet, you would be 45.