23 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 7 May 1998.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 17 years, year of birth 2003 or 2004
If now 26 years, year of birth 1994 or 1995
If now 42 years, year of birth 1978 or 1979

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