129 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1891 until 31 december 1891 inclusively, and his year of birth is 1892 if he was born from 1 January 1892 to 7 May 1892.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 18 years, year of birth 2002 or 2003
If now 22 years, year of birth 1998 or 1999
If now 55 years, year of birth 1965 or 1966

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