99 years old now in 2021 - what year born?


Today, 12 October 2021 if a person is 99 years old now, what year was he born? See below:


If 99 years old, year of birth is:
1921 or 1922*
*It depends on whether he was born before or after 1 January 1922.


If now 99 years and his year of birth 1921 if he was born after 12 October 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 12 October 1922.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 12 years, year of birth 2008 or 2009
If now 27 years, year of birth 1993 or 1994
If now 91 years, year of birth 1929 or 1930

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