87 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1933 until 31 december 1933 inclusively, and his year of birth is 1934 if he was born from 1 January 1934 to 7 May 1934.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 18 years, year of birth 2002 or 2003
If now 22 years, year of birth 1998 or 1999
If now 37 years, year of birth 1983 or 1984

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