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Sometime in the next calendar year after your birth year, you will have your first birthday.

Birth year + 1 = the next year

Birth year + 2 = the year after that

This pattern will remain for the rest of your life.

The year of your 20th birthday will be 20 years after your birth.

Repeat, as necessary, until one of the years is the current one.

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Q: Why does adding birth year to age in current year equal current year?
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Why does the sum of a birth year and a current age equal 110?

It doesn't. This may be a coincident. I attempted this with my birth year and my current age. 1+9+9+2 (Sum of the year of my birth) = 22 + 19 (my current age) = 41.


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