138 years old now in 2021 - what year born?


Today, 12 September 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 12 September 1882 until 31 december 1882 inclusively, and his year of birth is 1883 if he was born from 1 January 1883 to 12 September 1883.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 18 years, year of birth 2002 or 2003
If now 26 years, year of birth 1994 or 1995
If now 63 years, year of birth 1957 or 1958

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