123 years old now in 2021 - what year born?


Today, 16 May 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 16 May 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 16 May 1898.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 18 years, year of birth 2002 or 2003
If now 23 years, year of birth 1997 or 1998
If now 47 years, year of birth 1973 or 1974

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