107 years old now in 2020 - what year born?


Today, 20 September 2020 if a person is 107 years old now, what year was he born? See below:


If 107 years old, year of birth is:
1912 or 1913*
*It depends on whether he was born before or after 1 January 1913.


If now 107 years and his year of birth 1912 if he was born after 20 September 1912 until 31 december 1912 inclusively, and his year of birth is 1913 if he was born from 1 January 1913 to 20 September 1913.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 14 years, year of birth 2005 or 2006
If now 21 years, year of birth 1998 or 1999
If now 32 years, year of birth 1987 or 1988

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