77 years old now in 2021 - what year born?


Today, 24 September 2021 if a person is 77 years old now, what year was he born? See below:


If 77 years old, year of birth is:
1943 or 1944*
*It depends on whether he was born before or after 1 January 1944.


If now 77 years and his year of birth 1943 if he was born after 24 September 1943 until 31 december 1943 inclusively, and his year of birth is 1944 if he was born from 1 January 1944 to 24 September 1944.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 18 years, year of birth 2002 or 2003
If now 24 years, year of birth 1996 or 1997
If now 76 years, year of birth 1944 or 1945

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