138 years old now in 2021 - what year born?


Today, 19 June 2021 if a person is 138 years old now, what year was he born? See below:


If 138 years old, year of birth is:
1882 or 1883*
*It depends on whether he was born before or after 1 January 1883.


If now 138 years and his year of birth 1882 if he was born after 19 June 1882 until 31 december 1882 inclusively, and his year of birth is 1883 if he was born from 1 January 1883 to 19 June 1883.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 15 years, year of birth 2005 or 2006
If now 20 years, year of birth 2000 or 2001
If now 52 years, year of birth 1968 or 1969

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