138 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 138 years old now, what year was he born? See below:


If 138 years old, year of birth is:
1884 or 1885*
*It depends on whether he was born before or after 1 January 1885.


If now 138 years and his year of birth 1884 if he was born after 31 January 1884 until 31 december 1884 inclusively, and his year of birth is 1885 if he was born from 1 January 1885 to 31 January 1885.


Other examples:

If now 5 years, year of birth 2017 or 2018
If now 18 years, year of birth 2004 or 2005
If now 19 years, year of birth 2003 or 2004
If now 73 years, year of birth 1949 or 1950

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