104 years old now in 2022 - what year born?


Today, 27 September 2022 if a person is 104 years old now, what year was he born? See below:


If 104 years old, year of birth is:
1917 or 1918*
*It depends on whether he was born before or after 1 January 1918.


If now 104 years and his year of birth 1917 if he was born after 27 September 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 27 September 1918.


Other examples:

If now 11 years, year of birth 2010 or 2011
If now 15 years, year of birth 2006 or 2007
If now 30 years, year of birth 1991 or 1992
If now 61 years, year of birth 1960 or 1961

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