23 years old now in 2021 - what year born?


Today, 25 September 2021 if a person is 23 years old now, what year was he born? See below:


If 23 years old, year of birth is:
1997 or 1998*
*It depends on whether he was born before or after 1 January 1998.


If now 23 years and his year of birth 1997 if he was born after 25 September 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 25 September 1998.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 14 years, year of birth 2006 or 2007
If now 22 years, year of birth 1998 or 1999
If now 89 years, year of birth 1931 or 1932

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