72 years old now in 2021 - what year born?


Today, 13 September 2021 if a person is 72 years old now, what year was he born? See below:


If 72 years old, year of birth is:
1948 or 1949*
*It depends on whether he was born before or after 1 January 1949.


If now 72 years and his year of birth 1948 if he was born after 13 September 1948 until 31 december 1948 inclusively, and his year of birth is 1949 if he was born from 1 January 1949 to 13 September 1949.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 18 years, year of birth 2002 or 2003
If now 22 years, year of birth 1998 or 1999
If now 40 years, year of birth 1980 or 1981

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