105 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 105 years old now, what year was he born? See below:


If 105 years old, year of birth is:
1917 or 1918*
*It depends on whether he was born before or after 1 January 1918.


If now 105 years and his year of birth 1917 if he was born after 31 January 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 31 January 1918.


Other examples:

If now 6 years, year of birth 2016 or 2017
If now 17 years, year of birth 2005 or 2006
If now 23 years, year of birth 1999 or 2000
If now 58 years, year of birth 1964 or 1965

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