138 years old now in 2022 - what year born?


Today, 27 September 2022 if a person is 138 years old now, what year was he born? See below:


If 138 years old, year of birth is:
1883 or 1884*
*It depends on whether he was born before or after 1 January 1884.


If now 138 years and his year of birth 1883 if he was born after 27 September 1883 until 31 december 1883 inclusively, and his year of birth is 1884 if he was born from 1 January 1884 to 27 September 1884.


Other examples:

If now 12 years, year of birth 2009 or 2010
If now 18 years, year of birth 2003 or 2004
If now 20 years, year of birth 2001 or 2002
If now 85 years, year of birth 1936 or 1937

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