129 years old now in 2021 - what year born?


Today, 23 September 2021 if a person is 129 years old now, what year was he born? See below:


If 129 years old, year of birth is:
1891 or 1892*
*It depends on whether he was born before or after 1 January 1892.


If now 129 years and his year of birth 1891 if he was born after 23 September 1891 until 31 december 1891 inclusively, and his year of birth is 1892 if he was born from 1 January 1892 to 23 September 1892.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 15 years, year of birth 2005 or 2006
If now 30 years, year of birth 1990 or 1991
If now 35 years, year of birth 1985 or 1986

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