129 years old now in 2021 - what year born?


Today, 26 January 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 26 January 1891 until 31 december 1891 inclusively, and his year of birth is 1892 if he was born from 1 January 1892 to 26 January 1892.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 12 years, year of birth 2008 or 2009
If now 30 years, year of birth 1990 or 1991
If now 33 years, year of birth 1987 or 1988

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