40 years old now in 2024 - what year born?


Today, 15 April 2024 if a person is 40 years old now, what year was he born? See below:


If 40 years old, year of birth is:
1983 or 1984*
*It depends on whether he was born before or after 1 January 1984.


If now 40 years and his year of birth 1983 if he was born after 15 April 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 15 April 1984.


Other examples:

If now 8 years, year of birth 2015 or 2016
If now 18 years, year of birth 2005 or 2006
If now 27 years, year of birth 1996 or 1997
If now 63 years, year of birth 1960 or 1961

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