133 years old now in 2021 - what year born?


Today, 17 May 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 17 May 1887 until 31 december 1887 inclusively, and his year of birth is 1888 if he was born from 1 January 1888 to 17 May 1888.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 16 years, year of birth 2004 or 2005
If now 19 years, year of birth 2001 or 2002
If now 61 years, year of birth 1959 or 1960

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