108 years old now in 2020 - what year born?


Today, 21 October 2020 if a person is 108 years old now, what year was he born? See below:


If 108 years old, year of birth is:
1911 or 1912*
*It depends on whether he was born before or after 1 January 1912.


If now 108 years and his year of birth 1911 if he was born after 21 October 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 21 October 1912.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 18 years, year of birth 2001 or 2002
If now 20 years, year of birth 1999 or 2000
If now 43 years, year of birth 1976 or 1977

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