105 years old now in 2024 - what year born?


Today, 7 November 2024 if a person is 105 years old now, what year was he born? See below:


If 105 years old, year of birth is:
1918 or 1919*
*It depends on whether he was born before or after 1 January 1919.


If now 105 years and his year of birth 1918 if he was born after 7 November 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 7 November 1919.


Other examples:

If now 4 years, year of birth 2019 or 2020
If now 14 years, year of birth 2009 or 2010
If now 21 years, year of birth 2002 or 2003
If now 99 years, year of birth 1924 or 1925

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