139 years old now in 2021 - what year born?


Today, 17 May 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 17 May 1881 until 31 december 1881 inclusively, and his year of birth is 1882 if he was born from 1 January 1882 to 17 May 1882.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 15 years, year of birth 2005 or 2006
If now 21 years, year of birth 1999 or 2000
If now 78 years, year of birth 1942 or 1943

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