138 years old now in 2021 - what year born?


Today, 7 March 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 7 March 1882 until 31 december 1882 inclusively, and his year of birth is 1883 if he was born from 1 January 1883 to 7 March 1883.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 17 years, year of birth 2003 or 2004
If now 23 years, year of birth 1997 or 1998
If now 91 years, year of birth 1929 or 1930

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