103 years old now in 2021 - what year born?


Today, 21 January 2021 if a person is 103 years old now, what year was he born? See below:


If 103 years old, year of birth is:
1917 or 1918*
*It depends on whether he was born before or after 1 January 1918.


If now 103 years and his year of birth 1917 if he was born after 21 January 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 21 January 1918.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 15 years, year of birth 2005 or 2006
If now 30 years, year of birth 1990 or 1991
If now 73 years, year of birth 1947 or 1948

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