123 years old now in 2020 - what year born?


Today, 24 September 2020 if a person is 123 years old now, what year was he born? See below:


If 123 years old, year of birth is:
1896 or 1897*
*It depends on whether he was born before or after 1 January 1897.


If now 123 years and his year of birth 1896 if he was born after 24 September 1896 until 31 december 1896 inclusively, and his year of birth is 1897 if he was born from 1 January 1897 to 24 September 1897.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 16 years, year of birth 2003 or 2004
If now 23 years, year of birth 1996 or 1997
If now 54 years, year of birth 1965 or 1966

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