105 years old now in 2022 - what year born?


Today, 17 May 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 17 May 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 17 May 1917.


Other examples:

If now 12 years, year of birth 2009 or 2010
If now 17 years, year of birth 2004 or 2005
If now 28 years, year of birth 1993 or 1994
If now 43 years, year of birth 1978 or 1979

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