39 years old now in 2023 - what year born?


Today, 1 December 2023 if a person is 39 years old now, what year was he born? See below:


If 39 years old, year of birth is:
1983 or 1984*
*It depends on whether he was born before or after 1 January 1984.


If now 39 years and his year of birth 1983 if he was born after 1 December 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 1 December 1984.


Other examples:

If now 3 years, year of birth 2019 or 2020
If now 12 years, year of birth 2010 or 2011
If now 30 years, year of birth 1992 or 1993
If now 63 years, year of birth 1959 or 1960

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