121 years old now in 2022 - what year born?


Today, 28 September 2022 if a person is 121 years old now, what year was he born? See below:


If 121 years old, year of birth is:
1900 or 1901*
*It depends on whether he was born before or after 1 January 1901.


If now 121 years and his year of birth 1900 if he was born after 28 September 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 28 September 1901.


Other examples:

If now 3 years, year of birth 2018 or 2019
If now 13 years, year of birth 2008 or 2009
If now 27 years, year of birth 1994 or 1995
If now 85 years, year of birth 1936 or 1937

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