43 years old now in 2021 - what year born?


Today, 11 September 2021 if a person is 43 years old now, what year was he born? See below:


If 43 years old, year of birth is:
1977 or 1978*
*It depends on whether he was born before or after 1 January 1978.


If now 43 years and his year of birth 1977 if he was born after 11 September 1977 until 31 december 1977 inclusively, and his year of birth is 1978 if he was born from 1 January 1978 to 11 September 1978.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 18 years, year of birth 2002 or 2003
If now 26 years, year of birth 1994 or 1995
If now 59 years, year of birth 1961 or 1962

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