105 years old now in 2022 - what year born?


Today, 27 September 2022 if a person is 105 years old now, what year was he born? See below:


If 105 years old, year of birth is:
1916 or 1917*
*It depends on whether he was born before or after 1 January 1917.


If now 105 years and his year of birth 1916 if he was born after 27 September 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 27 September 1917.


Other examples:

If now 12 years, year of birth 2009 or 2010
If now 15 years, year of birth 2006 or 2007
If now 29 years, year of birth 1992 or 1993
If now 81 years, year of birth 1940 or 1941

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