87 years old now in 2021 - what year born?


Today, 31 July 2021 if a person is 87 years old now, what year was he born? See below:


If 87 years old, year of birth is:
1933 or 1934*
*It depends on whether he was born before or after 1 January 1934.


If now 87 years and his year of birth 1933 if he was born after 31 July 1933 until 31 december 1933 inclusively, and his year of birth is 1934 if he was born from 1 January 1934 to 31 July 1934.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 12 years, year of birth 2008 or 2009
If now 25 years, year of birth 1995 or 1996
If now 65 years, year of birth 1955 or 1956

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