105 years old now in 2021 - what year born?


Today, 20 June 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 20 June 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 20 June 1916.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 16 years, year of birth 2004 or 2005
If now 24 years, year of birth 1996 or 1997
If now 69 years, year of birth 1951 or 1952

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