87 years old now in 2021 - what year born?


Today, 20 October 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 20 October 1933 until 31 december 1933 inclusively, and his year of birth is 1934 if he was born from 1 January 1934 to 20 October 1934.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 15 years, year of birth 2005 or 2006
If now 21 years, year of birth 1999 or 2000
If now 94 years, year of birth 1926 or 1927

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