99 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 7 May 1922.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 18 years, year of birth 2002 or 2003
If now 25 years, year of birth 1995 or 1996
If now 60 years, year of birth 1960 or 1961

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