138 years old now in 2020 - what year born?


Today, 1 December 2020 if a person is 138 years old now, what year was he born? See below:


If 138 years old, year of birth is:
1881 or 1882*
*It depends on whether he was born before or after 1 January 1882.


If now 138 years and his year of birth 1881 if he was born after 1 December 1881 until 31 december 1881 inclusively, and his year of birth is 1882 if he was born from 1 January 1882 to 1 December 1882.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 15 years, year of birth 2004 or 2005
If now 24 years, year of birth 1995 or 1996
If now 95 years, year of birth 1924 or 1925

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