99 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 99 years old now, what year was he born? See below:


If 99 years old, year of birth is:
1920 or 1921*
*It depends on whether he was born before or after 1 January 1921.


If now 99 years and his year of birth 1920 if he was born after 19 September 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 19 September 1921.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 13 years, year of birth 2006 or 2007
If now 25 years, year of birth 1994 or 1995
If now 56 years, year of birth 1963 or 1964

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