73 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 73 years old now, what year was he born? See below:


If 73 years old, year of birth is:
1946 or 1947*
*It depends on whether he was born before or after 1 January 1947.


If now 73 years and his year of birth 1946 if he was born after 19 September 1946 until 31 december 1946 inclusively, and his year of birth is 1947 if he was born from 1 January 1947 to 19 September 1947.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 18 years, year of birth 2001 or 2002
If now 20 years, year of birth 1999 or 2000
If now 57 years, year of birth 1962 or 1963

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