143 years old now in 2021 - what year born?


Today, 18 September 2021 if a person is 143 years old now, what year was he born? See below:


If 143 years old, year of birth is:
1877 or 1878*
*It depends on whether he was born before or after 1 January 1878.


If now 143 years and his year of birth 1877 if he was born after 18 September 1877 until 31 december 1877 inclusively, and his year of birth is 1878 if he was born from 1 January 1878 to 18 September 1878.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 15 years, year of birth 2005 or 2006
If now 18 years, year of birth 2002 or 2003
If now 86 years, year of birth 1934 or 1935

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