40 years old now in 2021 - what year born?


Today, 20 June 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 20 June 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 20 June 1981.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 13 years, year of birth 2007 or 2008
If now 25 years, year of birth 1995 or 1996
If now 59 years, year of birth 1961 or 1962

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