123 years old now in 2021 - what year born?


Today, 4 August 2021 if a person is 123 years old now, what year was he born? See below:


If 123 years old, year of birth is:
1897 or 1898*
*It depends on whether he was born before or after 1 January 1898.


If now 123 years and his year of birth 1897 if he was born after 4 August 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 4 August 1898.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 17 years, year of birth 2003 or 2004
If now 21 years, year of birth 1999 or 2000
If now 85 years, year of birth 1935 or 1936

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