40 years old now in 2021 - what year born?


Today, 13 September 2021 if a person is 40 years old now, what year was he born? See below:


If 40 years old, year of birth is:
1980 or 1981*
*It depends on whether he was born before or after 1 January 1981.


If now 40 years and his year of birth 1980 if he was born after 13 September 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 13 September 1981.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 15 years, year of birth 2005 or 2006
If now 22 years, year of birth 1998 or 1999
If now 66 years, year of birth 1954 or 1955

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