23 years old now in 2020 - what year born?


Today, 23 September 2020 if a person is 23 years old now, what year was he born? See below:


If 23 years old, year of birth is:
1996 or 1997*
*It depends on whether he was born before or after 1 January 1997.


If now 23 years and his year of birth 1996 if he was born after 23 September 1996 until 31 december 1996 inclusively, and his year of birth is 1997 if he was born from 1 January 1997 to 23 September 1997.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 15 years, year of birth 2004 or 2005
If now 25 years, year of birth 1994 or 1995
If now 48 years, year of birth 1971 or 1972

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