40 years old now in 2021 - what year born?


Today, 7 March 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 7 March 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 7 March 1981.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 16 years, year of birth 2004 or 2005
If now 19 years, year of birth 2001 or 2002
If now 32 years, year of birth 1988 or 1989

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