40 years old now in 2022 - what year born?


Today, 27 September 2022 if a person is 40 years old now, what year was he born? See below:


If 40 years old, year of birth is:
1981 or 1982*
*It depends on whether he was born before or after 1 January 1982.


If now 40 years and his year of birth 1981 if he was born after 27 September 1981 until 31 december 1981 inclusively, and his year of birth is 1982 if he was born from 1 January 1982 to 27 September 1982.


Other examples:

If now 3 years, year of birth 2018 or 2019
If now 15 years, year of birth 2006 or 2007
If now 29 years, year of birth 1992 or 1993
If now 59 years, year of birth 1962 or 1963

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