91 years old now in 2021 - what year born?


Today, 17 May 2021 if a person is 91 years old now, what year was he born? See below:


If 91 years old, year of birth is:
1929 or 1930*
*It depends on whether he was born before or after 1 January 1930.


If now 91 years and his year of birth 1929 if he was born after 17 May 1929 until 31 december 1929 inclusively, and his year of birth is 1930 if he was born from 1 January 1930 to 17 May 1930.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 14 years, year of birth 2006 or 2007
If now 29 years, year of birth 1991 or 1992
If now 88 years, year of birth 1932 or 1933

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