105 years old now in 2021 - what year born?


Today, 8 March 2021 if a person is 105 years old now, what year was he born? See below:


If 105 years old, year of birth is:
1915 or 1916*
*It depends on whether he was born before or after 1 January 1916.


If now 105 years and his year of birth 1915 if he was born after 8 March 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 8 March 1916.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 13 years, year of birth 2007 or 2008
If now 27 years, year of birth 1993 or 1994
If now 94 years, year of birth 1926 or 1927

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