102 years old now in 2021 - what year born?


Today, 18 September 2021 if a person is 102 years old now, what year was he born? See below:


If 102 years old, year of birth is:
1918 or 1919*
*It depends on whether he was born before or after 1 January 1919.


If now 102 years and his year of birth 1918 if he was born after 18 September 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 18 September 1919.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 13 years, year of birth 2007 or 2008
If now 20 years, year of birth 2000 or 2001
If now 42 years, year of birth 1978 or 1979

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