99 years old now in 2021 - what year born?


Today, 28 January 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 28 January 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 28 January 1922.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 14 years, year of birth 2006 or 2007
If now 19 years, year of birth 2001 or 2002
If now 73 years, year of birth 1947 or 1948

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