139 years old now in 2021 - what year born?


Today, 23 January 2021 if a person is 139 years old now, what year was he born? See below:


If 139 years old, year of birth is:
1881 or 1882*
*It depends on whether he was born before or after 1 January 1882.


If now 139 years and his year of birth 1881 if he was born after 23 January 1881 until 31 december 1881 inclusively, and his year of birth is 1882 if he was born from 1 January 1882 to 23 January 1882.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 13 years, year of birth 2007 or 2008
If now 20 years, year of birth 2000 or 2001
If now 35 years, year of birth 1985 or 1986

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