85 years old now in 2021 - what year born?


Today, 27 January 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 27 January 1935 until 31 december 1935 inclusively, and his year of birth is 1936 if he was born from 1 January 1936 to 27 January 1936.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 18 years, year of birth 2002 or 2003
If now 20 years, year of birth 2000 or 2001
If now 40 years, year of birth 1980 or 1981

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