23 years old now in 2021 - what year born?


Today, 28 December 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 28 December 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 28 December 1998.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 15 years, year of birth 2005 or 2006
If now 20 years, year of birth 2000 or 2001
If now 70 years, year of birth 1950 or 1951

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