23 years old now in 2021 - what year born?


Today, 18 January 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 18 January 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 18 January 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 28 years, year of birth 1992 or 1993
If now 62 years, year of birth 1958 or 1959

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