129 years old now in 2022 - what year born?


Today, 4 July 2022 if a person is 129 years old now, what year was he born? See below:


If 129 years old, year of birth is:
1892 or 1893*
*It depends on whether he was born before or after 1 January 1893.


If now 129 years and his year of birth 1892 if he was born after 4 July 1892 until 31 december 1892 inclusively, and his year of birth is 1893 if he was born from 1 January 1893 to 4 July 1893.


Other examples:

If now 9 years, year of birth 2012 or 2013
If now 15 years, year of birth 2006 or 2007
If now 18 years, year of birth 2003 or 2004
If now 54 years, year of birth 1967 or 1968

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