99 years old now in 2021 - what year born?


Today, 31 July 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 31 July 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 31 July 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 22 years, year of birth 1998 or 1999
If now 53 years, year of birth 1967 or 1968

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