77 years old now in 2021 - what year born?


Today, 25 January 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 25 January 1943 until 31 december 1943 inclusively, and his year of birth is 1944 if he was born from 1 January 1944 to 25 January 1944.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 13 years, year of birth 2007 or 2008
If now 22 years, year of birth 1998 or 1999
If now 49 years, year of birth 1971 or 1972

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