73 years old now in 2021 - what year born?


Today, 20 July 2021 if a person is 73 years old now, what year was he born? See below:


If 73 years old, year of birth is:
1947 or 1948*
*It depends on whether he was born before or after 1 January 1948.


If now 73 years and his year of birth 1947 if he was born after 20 July 1947 until 31 december 1947 inclusively, and his year of birth is 1948 if he was born from 1 January 1948 to 20 July 1948.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 12 years, year of birth 2008 or 2009
If now 25 years, year of birth 1995 or 1996
If now 65 years, year of birth 1955 or 1956

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