123 years old now in 2022 - what year born?


Today, 1 October 2022 if a person is 123 years old now, what year was he born? See below:


If 123 years old, year of birth is:
1898 or 1899*
*It depends on whether he was born before or after 1 January 1899.


If now 123 years and his year of birth 1898 if he was born after 1 October 1898 until 31 december 1898 inclusively, and his year of birth is 1899 if he was born from 1 January 1899 to 1 October 1899.


Other examples:

If now 7 years, year of birth 2014 or 2015
If now 18 years, year of birth 2003 or 2004
If now 30 years, year of birth 1991 or 1992
If now 75 years, year of birth 1946 or 1947

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