85 years old now in 2021 - what year born?


Today, 11 October 2021 if a person is 85 years old now, what year was he born? See below:


If 85 years old, year of birth is:
1935 or 1936*
*It depends on whether he was born before or after 1 January 1936.


If now 85 years and his year of birth 1935 if he was born after 11 October 1935 until 31 december 1935 inclusively, and his year of birth is 1936 if he was born from 1 January 1936 to 11 October 1936.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 14 years, year of birth 2006 or 2007
If now 29 years, year of birth 1991 or 1992
If now 81 years, year of birth 1939 or 1940

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