78 years old now in 2021 - what year born?


Today, 21 January 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 January 1942 until 31 december 1942 inclusively, and his year of birth is 1943 if he was born from 1 January 1943 to 21 January 1943.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 16 years, year of birth 2004 or 2005
If now 20 years, year of birth 2000 or 2001
If now 85 years, year of birth 1935 or 1936

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