37 years old now in 2021 - what year born?


Today, 13 October 2021 if a person is 37 years old now, what year was he born? See below:


If 37 years old, year of birth is:
1983 or 1984*
*It depends on whether he was born before or after 1 January 1984.


If now 37 years and his year of birth 1983 if he was born after 13 October 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 13 October 1984.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 12 years, year of birth 2008 or 2009
If now 18 years, year of birth 2002 or 2003
If now 66 years, year of birth 1954 or 1955

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