105 years old now in 2020 - what year born?


Today, 29 November 2020 if a person is 105 years old now, what year was he born? See below:


If 105 years old, year of birth is:
1914 or 1915*
*It depends on whether he was born before or after 1 January 1915.


If now 105 years and his year of birth 1914 if he was born after 29 November 1914 until 31 december 1914 inclusively, and his year of birth is 1915 if he was born from 1 January 1915 to 29 November 1915.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 12 years, year of birth 2007 or 2008
If now 25 years, year of birth 1994 or 1995
If now 88 years, year of birth 1931 or 1932

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