78 years old now in 2021 - what year born?


Today, 21 September 2021 if a person is 78 years old now, what year was he born? See below:


If 78 years old, year of birth is:
1942 or 1943*
*It depends on whether he was born before or after 1 January 1943.


If now 78 years and his year of birth 1942 if he was born after 21 September 1942 until 31 december 1942 inclusively, and his year of birth is 1943 if he was born from 1 January 1943 to 21 September 1943.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 13 years, year of birth 2007 or 2008
If now 28 years, year of birth 1992 or 1993
If now 68 years, year of birth 1952 or 1953

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