133 years old now in 2021 - what year born?


Today, 16 September 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 16 September 1887 until 31 december 1887 inclusively, and his year of birth is 1888 if he was born from 1 January 1888 to 16 September 1888.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 16 years, year of birth 2004 or 2005
If now 30 years, year of birth 1990 or 1991
If now 87 years, year of birth 1933 or 1934

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