133 years old now in 2021 - what year born?


Today, 21 January 2021 if a person is 133 years old now, what year was he born? See below:


If 133 years old, year of birth is:
1887 or 1888*
*It depends on whether he was born before or after 1 January 1888.


If now 133 years and his year of birth 1887 if he was born after 21 January 1887 until 31 december 1887 inclusively, and his year of birth is 1888 if he was born from 1 January 1888 to 21 January 1888.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 14 years, year of birth 2006 or 2007
If now 24 years, year of birth 1996 or 1997
If now 40 years, year of birth 1980 or 1981

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